Page 85 - CITS - Fitter - Trade Theory

FITTER - CITS

7 Compatibility with Various Electrode Gauges: Arc welding machines are designed to weld with electrodes
of different gauges, providing the necessary current output to accommodate varying electrode sizes and types.
8 Welding of Thin and Thick Plates, Ferrous and Non-Ferrous Metals: Arc welding machines are versatile,
capable of welding a wide range of materials, including thin and thick plates, ferrous and non-ferrous metals,
providing the necessary current and voltage settings for each specific application.
1 Oil-Cooled Transformer Welding Machine:
• Oil-cooled transformer welding machines utilize a transformer that is immersed in oil for cooling purposes.
This type of welding machine is commonly used in heavy-duty welding applications where high currents are
required for welding thick materials or in continuous welding operations. The oil-cooled transformer helps
dissipate heat generated during welding, ensuring optimal performance and longevity of the welding machine.
These machines are suitable for various welding processes, including Shielded Metal Arc Welding (SMAW)
and Gas Metal Arc Welding (GMAW).
2 Air-Cooled Transformer Welding Machine:

• Air-cooled transformer welding machines rely on air circulation for cooling the transformer. Unlike oil-cooled
transformers, air-cooled transformers do not require immersion in oil and instead use fans or other air
circulation methods to dissipate heat generated during welding. These machines are typically more compact
and portable compared to oil-cooled transformer welding machines, making them suitable for mobile or field
welding applications where portability is essential. Air-cooled transformer welding machines are commonly
used in construction, repair, and maintenance applications.
• Care And Maintenance:

• Arc Welding Machines:
1 Regular Inspection: Perform regular visual inspections of the welding machine to check for signs of damage,
wear, or loose connections. Inspect cables, connectors, switches, and other components for any visible
damage or corrosion.
2 Cleaning: Keep the welding machine clean by removing dust, dirt, and debris from the exterior surfaces
regularly. Use compressed air or a soft brush to clean. ventilation ports, cooling fans, and other areas prone to
accumulation of dirt.

3 Cooling System Maintenance: If the welding machine has a cooling system (such as fans or liquid cooling),
ensure that it is functioning properly. Clean or replace air filters as needed to maintain proper airflow and
cooling efficiency.
4 Electrode Holder Maintenance: Check the condition of the electrode holder regularly. Inspect the jaws for
wear or damage, and replace them if necessary. Ensure that the electrode holder is clean and free from debris
to maintain a good electrical connection.
5 Ground Clamp Maintenance: Inspect the ground clamp for signs of wear, damage, or corrosion. Clean the
contact surfaces of the ground clamp and workpiece to ensure a good electrical connection and minimize
resistance.
6 Electrical Connections: Check all electrical connections, including cables, terminals, and connectors, for
tightness and corrosion. Loose or corroded connections can cause voltage drops, overheating, and reduced
welding performance.

7 Storage: When not in use, store the welding machine in a clean, dry, and well- ventilated area. Protect it from
moisture, dust, and extreme temperatures that can damage internal components.
8 Periodic Maintenance: Follow the manufacturer’s recommendations for periodic maintenance tasks, such as
lubrication of moving parts, calibration of controls, and inspection of internal components. Schedule routine
maintenance according to the machine’s usage and operating conditions.
9 Safety Checks: Prioritize safety by ensuring that all safety features, such as thermal overload protection and
circuit breakers, are functional. Test emergency stop buttons and other safety mechanisms regularly to verify
their proper operation.

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CITS : CG & M - Fitter - Lesson 12