Pro-Logic Technologies Limited provides professional welding machine repair, installation, troubleshooting, servicing, testing, and maintenance in Nairobi and surrounding areas. We handle different types of welding equipment used in fabrication workshops, construction sites, engineering companies, manufacturing plants, garages, schools, institutions, farms, and industrial facilities.
A welding machine is an important piece of equipment in many businesses. When a welder develops a fault, production can stop, fabrication work can be delayed, and the cost of operations can increase. For this reason, proper diagnosis and professional repair are important whenever a welding machine starts behaving abnormally.
At Pro-Logic Technologies Limited, we provide welding machine repair solutions for different technologies, capacities, and applications. Our technicians can inspect the machine, identify the source of the problem, test electrical and electronic components, repair or replace defective parts where appropriate, and test the equipment before returning it to service.
Our welding machine repair work covers conventional transformer welders, inverter welding machines, MIG welders, TIG welders, ARC welders, CO₂ welding machines, three-phase welding machines, industrial welding equipment, welding rectifiers, and other electrically operated welding systems.
We also assist customers with welding machine installation, electrical connections, commissioning, preventive maintenance, fault diagnosis, control-board troubleshooting, cooling-system inspection, cable replacement, and general servicing.
WELDING MACHINE INSTALLATION IN NAIROBI
Proper installation is just as important as repair. A welding machine can be new and still develop problems if it is incorrectly connected or operated from an unsuitable electrical supply.
Before installation, the machine should be assessed according to its electrical rating, phase requirements, input voltage, maximum current, duty cycle, cable requirements, earthing requirements, and intended application.
Our welding machine installation service can include assessment of the installation location, electrical supply inspection, machine positioning, connection of appropriate cables, grounding arrangements, protection-device assessment, commissioning, operational testing, and basic operator guidance.
For industrial machines, installation may require additional consideration of the workshop electrical distribution system. High-capacity welders can place significant demands on an electrical installation, particularly when several machines are operating simultaneously.
TYPES OF WELDING MACHINES WE REPAIR
Welding technology has developed considerably over the years. Modern welding machines range from simple transformer-based equipment to sophisticated inverter systems containing electronic control boards and power semiconductor devices.
Our repair services can cover:
- ARC welding machines
- MMA welding machines
- Stick welders
- MIG welding machines
- MAG welding machines
- TIG welding machines
- CO₂ welders
- Inverter welding machines
- IGBT inverter welders
- MOSFET inverter welders
- Welding rectifiers
- Transformer welding machines
- Three-phase welding machines
- Industrial welding machines
- Portable welding machines
- Workshop welding machines
- Welding generators
- Spot welding equipment
- Special-purpose welding equipment
- Plasma cutting and welding-related equipment
- Welding machine control systems
Each machine requires a different diagnostic approach. A conventional transformer welder, for example, has a substantially different internal architecture from a modern IGBT inverter welder.
ARC WELDER REPAIR
ARC welding machines are widely used in fabrication workshops, construction, metalwork, agricultural applications, garages, and general engineering.
An ARC or MMA welding machine may experience problems such as failure to power on, low welding current, unstable arc output, overheating, excessive sparking, abnormal noise, blown fuses, damaged cables, or complete loss of welding output.
Diagnosis normally begins with the input supply and progresses through the machine's internal electrical system. Depending on the design, technicians may inspect the main switch, input protection, transformer, rectifier components, capacitors, output connections, cooling system, current-control mechanism, and associated wiring.
For inverter ARC welders, the diagnostic process may additionally involve inspection of the input rectifier, DC bus capacitors, IGBT or MOSFET power devices, gate-drive circuitry, high-frequency transformer, secondary rectifier, output filtering, control PCB, current sensors, temperature sensors, and cooling fan.
MIG WELDER REPAIR
MIG welding machines are commonly used where continuous wire-feed welding is required. They are found in vehicle body repair, fabrication workshops, structural fabrication, manufacturing, metal furniture production, and many other applications.
A MIG welder is more complex than a basic ARC machine because the welding process involves several coordinated systems.
A typical MIG welding machine may contain:
- Power supply
- Welding power stage
- Wire-feed motor
- Wire-feed control circuit
- Welding torch
- Contact tip
- Gas solenoid
- Control panel
- Current-control system
- Voltage-control system
- Cooling fan
- Protection circuitry
- Electronic control board
A fault in any of these areas can affect welding performance.
For example, a machine may power on but fail to feed wire. Another may feed wire correctly but produce no welding arc. A machine may also have irregular wire feeding, poor penetration, excessive spatter, unstable voltage, or gas-flow problems.
Professional diagnosis helps determine whether the fault originates from the power section, control system, wire feeder, torch assembly, gas circuit, or external electrical supply.
TIG WELDER REPAIR
TIG welding machines require accurate control of welding current and, depending on the machine, additional functions such as high-frequency starting, pulse welding, gas control, and foot-pedal or remote control.
Common TIG welder faults include:
- Machine not powering on
- No welding output
- Difficulty starting the arc
- High-frequency start failure
- Gas not flowing
- Gas remaining on continuously
- Unstable welding current
- Pulse function failure
- Foot pedal failure
- Overheating
- Error or protection indications
- Control-panel problems
Repairing a TIG machine requires understanding both its power electronics and control circuitry. High-frequency ignition systems also require specialized troubleshooting because they operate differently from ordinary welding-output circuits.
INVERTER WELDING MACHINE REPAIR
Modern inverter welding machines are compact, efficient, and relatively lightweight compared with many traditional transformer welders. However, they contain electronic components that can be damaged by electrical surges, overheating, excessive loading, dust accumulation, moisture, incorrect input voltage, and poor maintenance.
Common inverter welding-machine components include:
- Input rectifier
- DC bus capacitors
- IGBT modules
- MOSFETs
- Gate-driver circuits
- High-frequency transformer
- Secondary rectifier
- Output inductors
- Current sensors
- Voltage sensors
- Control PCB
- Cooling fans
- Thermal protection
- Display and control panel
A machine can therefore appear simple from the outside while containing a sophisticated electronic power-conversion system internally.
At Pro-Logic Technologies Limited, inverter welder repair focuses on systematic diagnosis rather than simply replacing components without determining the original cause of failure.
IGBT WELDER REPAIR
IGBT technology is widely used in modern welding inverters. IGBTs operate as high-speed switching devices in the machine's power-conversion stage.
When an IGBT fails, the machine may stop working completely. In some cases, the failure may also damage associated gate-driver components, resistors, capacitors, diodes, tracks, or protection circuits.
Replacing an IGBT without checking the surrounding circuitry can result in repeated failure. The technician should determine why the device failed in the first place.
Possible contributing factors include overheating, excessive current, short circuits, inadequate cooling, electrical surges, defective gate-drive circuitry, damaged snubber components, or problems in the output section.
MOSFET WELDER REPAIR
Some inverter welding machines use MOSFET-based power stages. MOSFET failure can produce symptoms similar to other inverter faults, including blown input protection, machine shutdown, abnormal current draw, or complete failure to produce welding output.
Diagnosis may involve testing individual semiconductor devices and associated components while also checking the gate-drive and power-supply sections.
Because inverter circuits can contain dangerous stored electrical energy even after the machine has been disconnected from the mains, internal servicing should be carried out by appropriately trained technicians using suitable safety procedures.
WELDING MACHINE CONTROL BOARD REPAIR
The control board is responsible for coordinating different functions of an electronic welding machine.
Depending on the model, the PCB may control:
- Welding current
- Output voltage
- Wire feeding
- Gas timing
- Cooling fan operation
- Protection functions
- Temperature monitoring
- Display functions
- Pulse functions
- Arc-start functions
- Fault detection
A damaged control board can cause unusual machine behaviour even when the main power components are functioning.
PCB troubleshooting may involve visual inspection, component testing, checking supply rails, examining connectors and tracks, testing driver circuits, and identifying damaged components.
WELDING MACHINE POWER SUPPLY REPAIR
The input power section is one of the first areas considered during diagnosis.
Problems in this section can be caused by:
- Damaged input cables
- Loose terminals
- Faulty switches
- Blown protection devices
- Damaged rectifiers
- Failed capacitors
- Electrical surges
- Incorrect supply voltage
- Phase problems
- Internal short circuits
A machine that suddenly goes completely dead may have a power-input problem, but it may also be shutting down because a downstream power component has failed.
This is why replacing a fuse alone is not necessarily a complete repair.
WELDING MACHINE OVERHEATING
Overheating is a common cause of welding-machine failure.
A welding machine can overheat because of:
- Blocked ventilation
- Dust accumulation
- Failed cooling fan
- Excessive welding current
- Continuous operation beyond the duty cycle
- Damaged thermal sensor
- Poor workshop ventilation
- Internal component deterioration
- Incorrect machine application
Welding machines are designed with specific duty-cycle ratings. Operating continuously at maximum output can cause the thermal protection system to activate or may eventually damage internal components.
Regular cleaning and appropriate operating practices can reduce the likelihood of thermal failure.
WELDING MACHINE FAN REPAIR
Cooling fans are important in inverter and industrial welding machines.
A faulty fan can result in:
- Increased internal temperature
- Thermal shutdown
- Reduced machine performance
- Premature component failure
- Intermittent operation
During servicing, the fan should be checked for proper rotation, electrical supply, bearing condition, airflow, and physical obstruction.
Dust and metallic particles from fabrication environments can accumulate around cooling passages and fans. Periodic cleaning is therefore particularly important in busy workshops.
WELDING CABLE REPAIR AND REPLACEMENT
Welding cables carry high currents and are exposed to considerable physical stress.
Common cable problems include:
- Damaged insulation
- Broken conductors
- Loose terminals
- Burnt connectors
- Excessive heating
- Poor contact
- Damaged electrode holders
- Damaged earth clamps
A poor cable connection can cause voltage drop, unstable welding, excessive heating, and poor welding performance.
Cables should therefore be selected according to the machine's current rating and application.
WELDING MACHINE EARTHING
Correct earthing is an important part of welding-machine installation and workshop safety.
An appropriate earth connection helps provide a suitable path for fault currents and contributes to the overall electrical safety of the installation.
The welding return circuit should also be properly connected to the workpiece according to the welding process and equipment manufacturer's requirements.
Loose or damaged earth clamps can create poor welding performance and excessive resistance.
THREE-PHASE WELDING MACHINE REPAIR
Large industrial welding machines may require three-phase electrical supplies.
These machines are often used in:
- Manufacturing plants
- Engineering workshops
- Steel fabrication facilities
- Construction projects
- Industrial maintenance departments
- Large fabrication companies
Three-phase welding equipment requires careful attention to phase connections, supply voltage, protection, cable sizing, grounding, and load conditions.
If a three-phase machine suddenly stops working, diagnosis should establish whether the problem is inside the welding machine or originates from the electrical supply.
WELDING RECTIFIER REPAIR
Welding rectifiers convert electrical power into a suitable form for welding output. Depending on the machine design, rectification may involve diode assemblies, controlled rectifiers, or other semiconductor arrangements.
A defective rectifier can result in:
- Reduced output
- No welding current
- Excessive ripple
- Overheating
- Blown protection
- Unstable arc performance
Testing the rectifier section can help identify whether the problem originates from the power-conversion stage.
TRANSFORMER WELDER REPAIR
Traditional transformer welders are generally robust machines. They use electromagnetic transformers to reduce and transform electrical energy into a welding current suitable for the application.
Although their designs are less electronically complex than inverter machines, transformer welders can still develop faults.
Potential problems include:
- Damaged input wiring
- Burnt terminals
- Transformer winding problems
- Loose connections
- Damaged switches
- Cooling problems
- Faulty current adjustment
- Insulation deterioration
- Output cable damage
Transformer winding faults require specialized electrical assessment before deciding whether rewinding or replacement is appropriate.
WELDING MACHINE TRANSFORMER REWINDING
Where a transformer winding has suffered significant damage, rewinding may sometimes be considered.
A proper rewinding process involves determining the transformer construction and electrical requirements before removing and replacing the damaged winding.
The repaired transformer should then be appropriately insulated and tested before being returned to service.
Whether rewinding is economically practical depends on the machine's size, design, condition, replacement-part availability, and overall repair cost.
WELDING MACHINE FAULT DIAGNOSIS
Accurate diagnosis is one of the most important stages of welding-machine repair.
A professional diagnostic process may include:
Initial inspection
The technician examines the machine externally for obvious signs of damage, overheating, contamination, loose connections, burnt components, damaged cables, or other abnormalities.
Power-supply assessment
The input supply and machine ratings are compared to establish whether the machine is receiving the appropriate electrical supply.
Functional testing
The machine is operated where safe to determine the exact symptoms.
Internal inspection
Where necessary, the machine is opened for further examination.
Component testing
Relevant components are tested using appropriate electrical and electronic diagnostic methods.
Fault isolation
The defective circuit or component is identified.
Repair
Damaged components, wiring, connectors, or other repairable parts are addressed.
Final testing
The machine is tested to confirm that the original fault has been resolved and that the equipment operates appropriately.
COMMON WELDING MACHINE PROBLEMS
Customers commonly contact welding-machine technicians when their equipment develops symptoms such as:
MACHINE DOES NOT POWER ON
A machine that does not power on may have an input supply issue, damaged switch, blown protection, failed rectifier, shorted power semiconductor, damaged control power supply, or another internal fault.
MACHINE POWERS ON BUT DOES NOT WELD
This problem can occur when the control section operates but the welding-output stage has failed.
WELDING CURRENT IS TOO LOW
Low output may result from internal power-stage problems, poor connections, damaged cables, incorrect settings, or other electrical faults.
ARC IS UNSTABLE
An unstable arc can have several causes. The welding process, electrode, settings, cables, work connection, and machine output should all be considered during diagnosis.
MACHINE TRIPS THE BREAKER
Repeated breaker trips should not simply be ignored. The cause may involve excessive current, short circuits, incorrect supply arrangements, damaged internal components, or unsuitable protection.
MACHINE OVERHEATS QUICKLY
Rapid overheating may indicate cooling problems, excessive loading, blocked airflow, or internal electrical faults.
WIRE FEEDER DOES NOT WORK
For MIG machines, the wire-feed motor, control circuit, mechanical drive, torch system, and associated connections may need to be checked.
GAS DOES NOT FLOW
Gas-flow faults can involve the solenoid, control system, regulator, hose, torch, or external gas arrangement.
WELDING MACHINE PREVENTIVE MAINTENANCE
Preventive maintenance can extend the operating life of welding equipment and reduce unexpected downtime.
Maintenance may include:
- Cleaning internal ventilation areas
- Checking cooling fans
- Inspecting cables
- Checking terminals
- Inspecting earth clamps
- Checking welding torches
- Inspecting wire feeders
- Checking gas connections
- Inspecting control panels
- Checking machine ventilation
- Testing electrical connections
- Checking signs of overheating
- Inspecting PCB assemblies where applicable
Maintenance frequency depends on the operating environment and workload.
A machine used every day in a dusty fabrication workshop may require more frequent attention than equipment used occasionally in a clean environment.
WELDING MACHINE INSTALLATION FOR WORKSHOPS
A welding-machine installation should consider more than simply connecting a plug.
The workshop electrical infrastructure should be suitable for the machine's rated load. Cable capacity, protective devices, distribution boards, earthing, isolation, and the number of machines operating simultaneously should be considered.
For larger workshops, electrical load assessment becomes particularly important.
Several welding machines operating at the same time can create substantial demand on the electrical installation. Proper planning can help reduce nuisance tripping and excessive voltage drop.
INDUSTRIAL WELDING MACHINE SERVICES
Industrial welding equipment often operates under demanding conditions.
Industrial customers may require:
- Emergency repair
- Preventive maintenance
- Machine installation
- Commissioning
- Electrical troubleshooting
- Control-board repair
- Power-electronics repair
- Cable replacement
- Cooling-system servicing
- Performance testing
- Equipment inspection
For businesses where welding is part of daily production, minimizing downtime is critical.
WELDING MACHINE REPAIR FOR FABRICATION WORKSHOPS
Fabrication workshops depend heavily on welding equipment. A faulty machine can delay gates, grills, structural steelwork, machinery fabrication, vehicle repairs, furniture production, and other projects.
Pro-Logic Technologies Limited provides welding-machine troubleshooting and repair support for workshops that need their equipment returned to productive operation.
WELDING MACHINE REPAIR FOR CONSTRUCTION COMPANIES
Construction projects may use welding equipment for structural steelwork, pipework, reinforcement, machinery maintenance, metal frameworks, and general fabrication.
Machines used on construction sites are often exposed to dust, moisture, mechanical movement, extension cables, and demanding working conditions.
Regular inspection can help identify problems before they become major failures.
WELDING MACHINE REPAIR FOR GARAGES
Vehicle repair garages frequently use MIG, ARC, and other welding systems.
Common applications include vehicle body repair, chassis work, exhaust fabrication, brackets, metal repairs, and workshop maintenance.
A welding machine that produces inconsistent output can affect the quality of finished work. Proper diagnosis is therefore important.
WELDING MACHINE REPAIR IN NAIROBI CBD
Businesses operating in Nairobi CBD and surrounding commercial areas can access welding-machine repair services through Pro-Logic Technologies Limited.
Our main workshop is located at Luthuli Avenue, Kangari Building, 3rd Floor, KA7, making the location convenient for customers who need equipment assessment, repair, servicing, or spare-part support.
WELDING MACHINE REPAIR ALONG LUTHULI AVENUE
Luthuli Avenue is well known for electrical, electronics, engineering, and technical businesses. Customers looking for welding equipment services can have their machines assessed for electrical, electronic, and mechanical faults.
For machines that require workshop-level diagnosis, bringing the equipment for inspection can allow technicians to access the internal components and perform more detailed testing.
WELDING MACHINE SERVICES IN WESTLANDS
Businesses and workshops operating around Westlands can require welding equipment for maintenance, fabrication, construction, and engineering applications.
Pro-Logic Technologies Limited serves customers across Nairobi, including Westlands and surrounding areas, depending on the nature of the service required.
WELDING MACHINE REPAIR IN INDUSTRIAL AREA
Nairobi Industrial Area has numerous engineering, manufacturing, fabrication, automotive, and industrial businesses that depend on electrical machinery.
Welding-machine failures in such environments can result in production delays. Professional troubleshooting can help businesses identify faults and determine an appropriate repair strategy.
WELDING MACHINE REPAIR IN KAREN
Welding equipment is also used in residential construction, property maintenance, workshops, gates and grills fabrication, agricultural projects, and engineering work around Karen.
Customers in Karen can seek welding-machine diagnosis, servicing, installation, and maintenance support.
WELDING MACHINE REPAIR IN KILIMANI
Workshops, contractors, maintenance companies, and businesses around Kilimani may require welding equipment for different applications.
We provide welding-machine troubleshooting and technical support across Nairobi, including Kilimani and nearby areas.
WELDING MACHINE REPAIR IN KILELESHWA
Welding equipment used for property maintenance, construction, metal fabrication, and engineering work can require periodic servicing and repair.
Faulty equipment should be diagnosed rather than repeatedly operated in an abnormal condition.
WELDING MACHINE REPAIR IN LAVINGTON
Lavington and surrounding Nairobi areas are covered for welding-machine repair, installation, troubleshooting, and maintenance services.
WELDING MACHINE REPAIR IN KASARANI
Customers around Kasarani can seek assistance with welding-machine faults involving power supply, inverter electronics, cables, cooling systems, control boards, and welding output.
WELDING MACHINE REPAIR IN EMBakasi
Embakasi and surrounding industrial and commercial areas have numerous workshops and businesses that may depend on welding equipment.
Our repair service can assist with machine diagnosis, installation, maintenance, and electrical troubleshooting.
WELDING MACHINE REPAIR IN THIKA ROAD
The Thika Road corridor contains many workshops, engineering businesses, construction companies, and commercial facilities.
Welding machines used in these environments may require both routine maintenance and emergency repairs.
WELDING MACHINE REPAIR IN NGONG ROAD
Customers operating workshops or construction businesses along Ngong Road can access welding-machine repair and installation services.
WELDING MACHINE REPAIR IN NAIROBI AND SURROUNDING AREAS
Our service coverage can extend across numerous Nairobi neighbourhoods and surrounding areas, including:
- Nairobi CBD
- Luthuli Avenue
- Industrial Area
- Westlands
- Parklands
- Ngara
- Pangani
- Eastleigh
- Kariobangi
- Kasarani
- Roysambu
- Ruaraka
- Thika Road
- Embakasi
- Donholm
- Umoja
- Buruburu
- South B
- South C
- Lang'ata
- Karen
- Kilimani
- Hurlingham
- Lavington
- Kileleshwa
- Kawangware
- Dagoretti
- Ngong Road
- Kangemi
- Waiyaki Way
- Kikuyu
- Kiambu
- Ruaka
- Ruiru
- Thika
- Kitengela
- Athi River
Service availability can depend on the type and size of the welding machine and whether the equipment requires workshop-based diagnosis or on-site assessment.
WHY WELDING MACHINES FAIL
There is rarely a single reason why welding equipment fails.
Common causes include:
Electrical surges: Sudden voltage fluctuations can damage sensitive electronic components.
Overheating: Continuous operation beyond the machine's rated duty cycle can cause thermal stress.
Dust: Fabrication environments can contain metallic particles and dust that accumulate inside equipment.
Moisture: Water and humidity can contribute to corrosion and electrical problems.
Poor connections: Loose terminals can create resistance and heat.
Overloading: Using the machine beyond its intended capacity can shorten component life.
Incorrect installation: Unsuitable electrical supplies or protection can contribute to repeated faults.
Mechanical damage: Welding cables, torches, switches, and connectors can suffer physical damage through daily use.
WHY PROFESSIONAL WELDING MACHINE REPAIR MATTERS
A welding machine is a high-power electrical device. Attempting to repair complex internal circuits without proper knowledge can result in further equipment damage or serious electrical hazards.
Professional diagnosis allows the technician to identify the actual fault rather than replacing multiple components unnecessarily.
It can also help determine whether a machine should be repaired, refurbished, or replaced.
WELDING MACHINE REPAIR AND TESTING
After repair, the equipment should be tested before being returned to normal operation.
Testing may include checking the machine's power-up behaviour, output performance, cooling operation, controls, protection functions, and other relevant features.
The exact testing procedure depends on the welding machine type and manufacturer design.
WELDING MACHINE COMMISSIONING
Newly installed equipment should be commissioned properly.
Commissioning can include confirming electrical connections, checking machine settings, verifying accessories, testing operation, and ensuring the equipment is functioning appropriately for its intended application.
For industrial installations, commissioning should also take into account the wider electrical system and operational environment.
WELDING MACHINE SPARE PARTS
Some welding-machine repairs require replacement components.
Depending on the machine, parts may include:
- IGBT devices
- MOSFETs
- Rectifier diodes
- Capacitors
- Cooling fans
- Control boards
- Driver boards
- Switches
- Welding cables
- Electrode holders
- Earth clamps
- MIG wire feeders
- Solenoid valves
- Welding torches
- Connectors
- Thermal sensors
- Current sensors
- Fuses
- Relays
- Transformers
Availability of parts depends on the particular machine model and component specification.
WELDING MACHINE REPAIR BY PRO-LOGIC TECHNOLOGIES LIMITED
Pro-Logic Technologies Limited provides technical services for welding equipment used by workshops, contractors, manufacturers, engineering companies, garages, institutions, and individual customers.
Our approach is based on diagnosis, technical inspection, repair where practical, and testing after service.
We understand that welding equipment is often critical to a customer's daily operations. Our objective is therefore to provide a structured technical solution rather than simply treating the visible symptom.
WHEN SHOULD YOU SERVICE YOUR WELDING MACHINE?
You should consider having your machine inspected when you notice:
- Unusual noises
- Excessive heat
- Frequent thermal shutdown
- Weak welding output
- Unstable arc
- Intermittent power
- Burning smell
- Damaged cables
- Loose terminals
- Wire-feed problems
- Gas-flow problems
- Repeated breaker trips
- Error indicators
- Abnormal fan operation
- Machine refusing to start
Early diagnosis can sometimes prevent a small problem from developing into a more expensive failure.
CONCLUSION
Professional welding-machine repair and installation is important for maintaining reliable fabrication, engineering, construction, manufacturing, and workshop operations.
From traditional transformer welders to modern inverter, MIG, TIG, ARC, CO₂, IGBT, MOSFET, and industrial welding systems, different machines require different diagnostic and repair techniques.
Pro-Logic Technologies Limited provides welding machine repair, installation, troubleshooting, maintenance, testing, and technical support in Nairobi and surrounding areas. Our services cover power-supply faults, inverter failures, control-board problems, cooling issues, welding-output faults, cable problems, transformer-related issues, and other welding-machine faults.
For workshop-based technical assessment, our main workshop is at Luthuli Avenue, Kangari Building, 3rd Floor, KA7, Nairobi.
PRO-LOGIC TECHNOLOGIES LIMITED — PROFESSIONAL WELDING MACHINE REPAIR, INSTALLATION AND MAINTENANCE IN NAIROBI.