Possible causes of burning out the weld start may be the following:
- Welding current too high: If the welding current is too high, it can cause excessive heating at the start of the weld, which can result in a burn.
- Overlap too small: If the overlap between the welded pipes is too small, it can generate a concentration of heat at the start of the weld, which can lead to burn-through.
- Excessive welding force: Excessive welding force can compress the tubes too much at the start of the weld, causing excessive heating and possible burning.
- Incorrect adjustment of the calibration crown: If the calibration crown is adjusted incorrectly, it can generate uneven pressure at the start of the weld, which can result in a burn.
These are some possible causes, but it is important to keep in mind that each situation may be unique and it is advisable to perform a detailed analysis of the welding conditions to determine the exact cause.
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