1. What is welding?

Welding is a manufacturing and fabrication process used to join materials, most commonly metals, by applying heat, pressure, or a combination of both.

Different welding processes are suited to different materials, thicknesses, applications and working environments.

2. What are the main types of welding?

The most common welding processes include:

• MIG/MAG welding
• TIG welding
• MMA/Stick welding
• Flux-cored arc welding (FCAW)
• Gas welding
• Spot and resistance welding

The right process depends on the material, thickness, required weld quality, working environment and available equipment.

3. What is the difference between MIG, TIG and MMA welding?

MIG/MAG welding uses a continuously fed wire electrode and is generally suited to productive welding applications.

TIG welding uses a non-consumable tungsten electrode and provides precise control, making it useful for applications where weld appearance and control are important.

MMA or Stick welding uses coated electrodes and is widely used because the equipment can be relatively portable and suitable for outdoor work.

4. Which welding machine is best for beginners?

There is no single welding machine that is best for everyone.

For a beginner, the right choice depends on:

• Material being welded
• Material thickness
• Type of welding required
• Available power supply
• Portability
• Frequency of use
• Budget

For occasional repairs and general fabrication, an MMA machine may be a practical starting point. For more specialised work, MIG or TIG may be more appropriate.

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5. How do I choose the right welding electrode?

Electrode selection depends on the base metal, welding position, required strength, current type and application.

Always check the electrode manufacturer's specifications and the requirements of the welding procedure before selecting an electrode.

6. What do welding electrode numbers mean?

Electrode classifications such as E6013 or E7018 contain information about the electrode's characteristics and intended use.

The classification can indicate factors such as:

• Minimum tensile strength
• Welding position
• Electrode type or coating
• Current characteristics

The exact classification system depends on the applicable standard, so don't select an electrode based only on the number. Check the manufacturer's technical information and applicable welding specification.

7. Can I weld stainless steel with a normal welding machine?

The machine alone does not determine whether stainless steel can be welded.

The welding process, electrode or filler material, shielding gas where applicable, polarity, settings and technique all matter.

Stainless steel also requires appropriate preparation and contamination control to achieve the desired result.

8. Can aluminium be welded?

Yes. Aluminium can be welded using suitable processes and equipment.

TIG and MIG are commonly used for aluminium applications, but the correct machine configuration, filler material, shielding gas, settings and preparation are important.

Aluminium also has characteristics that make heat control and surface preparation particularly important.

9. Why does my weld keep cracking?

Weld cracking can have several causes.

Possible factors include:

• Incorrect welding parameters
• Poor joint preparation
• Contamination
• Incorrect filler material
• Excessive restraint
• Material characteristics
• Hydrogen-related problems
• Incorrect preheating or heat control

Repeated cracking should not simply be solved by adding more weld metal. The cause should be investigated.

10. Why is my welding electrode sticking?

An electrode may stick when the arc is difficult to establish or maintain.

Possible causes include:

• Incorrect current setting
• Incorrect arc length
• Poor electrode storage
• Incorrect technique
• Unsuitable electrode for the application
• Poor electrical connection

Start by checking the manufacturer's recommended current range and machine settings.

11. Why does my weld have too much spatter?

Excessive spatter can be caused by incorrect welding parameters, poor technique, unsuitable settings, contamination or incorrect equipment configuration.

For MIG/MAG welding, check factors such as:

• Voltage
• Wire-feed speed
• Shielding gas
• Contact-tip condition
• Wire type
• Torch position

Correct settings should be based on the equipment and consumable manufacturer's recommendations.

12. What causes porosity in a weld?

Porosity occurs when gas becomes trapped in the solidifying weld metal.

Possible causes include:

• Contamination
• Moisture
• Poor shielding
• Incorrect gas flow
• Drafts or wind
• Contaminated base material
• Improper electrode storage

Good surface preparation and appropriate shielding are important for reducing the risk of porosity.

13. Does welding require safety equipment?

Yes.

Welding can expose workers to hazards including intense light, heat, fumes, sparks and electric shock.

Appropriate PPE may include:

• Welding helmet
• Safety glasses
• Welding gloves
• Flame-resistant clothing
• Safety footwear
• Respiratory protection where required
• Hearing protection where appropriate

14. What is welding fume and why is ventilation important?

Welding fumes are produced during many welding and allied processes. Their composition depends on the materials, coatings, consumables and process involved.

Good ventilation and appropriate exposure controls are important when welding.

For workplace safety guidance, consult OSHA's Welding, Cutting and Brazing resources .

15. How should welding electrodes be stored?

Electrodes should be stored according to the manufacturer's instructions.

Some electrode types are particularly sensitive to moisture and may require controlled storage or drying procedures.

Poor storage can affect electrode performance and potentially contribute to weld-quality problems.

Always follow the electrode manufacturer's storage and handling requirements.

16. What is the difference between welding and fabrication?

Welding is the process of joining materials.

Fabrication is broader. It can involve cutting, forming, drilling, fitting, welding, finishing and assembling materials into a finished structure or component.

A fabrication project may therefore involve welding as only one part of the overall process.

17. How do I know if a welding company is qualified for my project?

Ask about:

• Previous projects
• Welding processes
• Materials handled
• Equipment
• Qualified personnel
• Welding procedures
• Inspection and testing
• Applicable standards
• Safety procedures
• Quality documentation

For more detailed guidance:

How to Choose the Best Welding Company in Nigeria →

18. What welding standards should I know about?

The appropriate standard depends on the type of welding and application.

ISO 3834 is an important international series covering quality requirements for fusion welding of metallic materials.

Other projects may require standards or specifications from organisations such as AWS, ASME, API or applicable Nigerian requirements.

For standards information, consult the relevant issuing organisation rather than relying on a generic online summary.

Learn more about welding quality requirements: ISO 3834 .

19. When should I replace a welding machine?

Consider replacement when the machine:

• Frequently fails
• Cannot deliver the required output
• Is no longer suitable for your applications
• Has obsolete or unavailable components
• Creates recurring downtime
• Cannot meet the required welding process or duty cycle

However, some problems may be repairable. Have the machine assessed before replacing it.

20. How do I choose a welding machine for industrial use?

Consider:

• Welding process
• Material
• Material thickness
• Required amperage
• Duty cycle
• Power supply
• Portability
• Working environment
• Frequency of use
• Available accessories and consumables
• Manufacturer support

For larger operations, selecting equipment based only on maximum amperage can be a mistake. The machine needs to match the actual application and workload.

21. Can welding be done outdoors?

Yes, but the welding process and environmental conditions matter.

Wind can interfere with shielding gas in processes such as MIG and TIG. Rain, moisture and wet working conditions can also introduce safety and quality concerns.

Outdoor welding should therefore be planned around appropriate equipment, protection, ventilation and site safety requirements.

22. Why is surface preparation important before welding?

Paint, rust, oil, grease, moisture and other contaminants can affect weld quality.

Proper preparation can help reduce defects and improve the consistency of the weld.

The required preparation depends on the material, welding process and project specification.

23. What is weld inspection?

Weld inspection is used to evaluate whether a weld meets specified requirements.

Depending on the application, inspection may include:

• Visual inspection
• Dimensional inspection
• Non-destructive testing
• Destructive testing
• Documentation review

The appropriate inspection method depends on the weld, material, application and applicable requirements.

24. What should I look for when buying welding equipment in Nigeria?

Don't look only at price.

Consider:

• Genuine specifications
• Power requirements
• Duty cycle
• Welding process
• Available consumables
• Spare parts
• Warranty and support
• Application
• Portability
• Manufacturer reputation

You can also compare the equipment against your actual workload before making a purchase.

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25. Where can I get welding equipment and safety products in Nigeria?

Tikweld supplies welding equipment, consumables, accessories and welding safety products for different applications.

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