How to adjust the gas flow when welding?
Energas helps you understand the parameters used to adjust your welding machine. Some processes require the addition of shielding gas to protect the weld pool. This should be taken into account when adjusting your TIG or MIG/MAG welding machine.
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The main welding defects
The main weld defects can be divided into two types: geometric defects and metallurgical defects.
Geometric weld defects are related to poor operational control of the welding process (torch angle, feed rate, current, voltage, etc.), while metallurgical weld defects can be related to numerous other parameters such as the presence of impurities, poorly adapted temperature cycles generating unwanted phases (filler metal poorly matched to the base metal, presence of carbide, poor ferrite/austenite balance, etc.).
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Avoid welding defects
Energas offers some tips and recommendations to avoid defects and improve welding quality for all types of welds and processes.
- Before welding, it is important to ensure that the welding equipment (torch, lead wire, contact tips, gas nozzle, etc.) is in good condition.
- Clean the metal parts to be welded (surface).
- Ensure proper gas shielding, especially outdoors to avoid drafts.
- Adapt the current (DC/AC, or polarity) to the process (metal, MIG/MAG/TIG), and follow the filler metal's recommendations, especially for flux-cored wires.
- Adjust the welding equipment's electrical parameters: current and voltage.
- Voltage, for example, plays an important role in wetting.
- Adjust the welding speed to the material thickness to maintain the required heat input and therefore the required linear energy, and avoid geometric defects such as grooves resulting from poor fusion of the weld bead edges.
- Adhere to the correct cooling times to achieve the correct interpass temperatures.
- Use a shielding gas suitable for the welding technique (arc welding: TIG, MIG/MAG, and plasma welding).
- Perform quality checks at various stages.
Energas, a leader in industrial gases and a specialist in industrial welding and cutting, can help you with every key aspect of your welding process. Don't hesitate to contact our experts.
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ISO14175 compliant welding gases
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