Weldtronic TM250C Operating Manual page 32

Welding results and troubleshooting
POOR WELD BEAD
1........ Large spatter deposits
2........ Rough, uneven bead
3........ Slight crater during welding
4........ Bad overlap
5........ Poor penetration
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GOOD WELD BEAD
1........ Fine spatter
2........ Uniform bead
3........ Moderate crater during welding
4........ No overlap
5........ Good penetration into base material