Materials
Common problems when welding 4130 chromoly
Quick answer
Common 4130 chromoly welding problems: heat-affected-zone cracking and loss of toughness if you weld too hot or too fast. Fix with preheat where required, correct filler and controlled cooling.
Problem → cause → fix
| Symptom | Cause | Fix |
|---|---|---|
| Cracks next to weld | HAZ issues | preheat 150–200°C, ER80S-D2 |
| Brittle joint | too hot | lower heat input, smaller passes |
| Distortion | uncontrolled heat | tack sequence, backstep |
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