Setting up equipment and selecting welding parameters
Equipment:
- Follow the hardware manufacturer's instructions to set up the hardware.
- Choose the right electrode holders (as short as possible).
- Accurately align the position of the electrode holders and tips.
- The tips of the electrodes must be convex (roughly shape with a file, fine-tune the shape with a grinder).
Body:
- Make sure that the flanges to be joined are perfectly aligned with each other.
- Prepare a clean metal surface at the joint (inside and outside).
Notes on methodology / technology:
- Make a test weld on a piece of material covered with welding paste.
- If any metal elements are located between the electrode holders, this will lead to a decrease in induction, and, consequently, to a loss of power (adjust current settings).
- For high strength low alloy steel, power adjustment is required.
- Re-welding over old welds often leads to poor weld quality.
- Hold the electrode tips at an angle to the contact surface as close to 90°as possible.
- Maintain pressure on the electrodes for a short time after welding is complete.
- Electrodes work best if they are convex. Regularly clean the contact surface of the electrodes.
Resistance spot welding is used on panels with a thickness of at least 3 mm.
Welding equipment used to repair the bodies of modern Land Rover vehicles must ensure reliable welding of galvanized high-strength steel panels, consisting of three or more layers with a total thickness of up to 5 mm. If resistance welding equipment does not meet these requirements, electric rivet welding must be used for safety reasons. Electrical specifications (current, resistance, heat) resistance spot welding equipment differ depending on the type of equipment. Therefore, with regard to the actual characteristics of the welding process, it is important to follow the equipment manufacturer's instructions.
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