Welder technique matters. A cold crater (abrupt stop) creates a solidification void. As the weld cools, the surface tension pulls the crater apart, initiating a crack that runs back into the cap.
Where possible, change the welding sequence. Use back-step welding or tack welding to distribute shrinkage forces evenly. Pre-bending plates to counteract shrinkage can also help. cymcap hot crack
To avoid hot cracking and thermal failure in a grounding design, engineers employ the following strategies validated by CymCap analysis: Welder technique matters