We are stainless steel wire manufacturer, so we learn more about steel wires. Here I will tell you the reasons of shape defects of submerged arc welded joints.
1. No penetration
The main reason for no penetration is the welding current is small, the welding speed too fast. This defect is also caused by weld wire deviation from the weld centerline or arc. Groove angle is small, blunt edge is too large will produce not penetration.
2. Not fused
The causes of non-fusion, mainly welding torch deviation from the weld center or arc. A small welding current can also cause no-fusion.
3. Slagging
The slag that generated during the multi-layer welding or solid welding is not cleared when welding the next layer.
4. Inclusions
Workpiece tilting, arc, wire tilt and other reasons to molten molten slag flow to the front of the arc, the arc after the slag did not float to form slag.
5. Undercut
When welding is too large welding, fillet welding wire angle is too large, will produce undercurrent phenomenon.
6. Welding tumor
Welding speed is too slow, resulting in molten metal overflow.
7.Burn through
Welding current is too large. Welding speed is too small. Groove gap root gap is too large.
8. Dent
Flux particle size is small, the gas generated in the molten pool to stay in the slag and weld metal, due to the pressure of gas to form pits. Flux alkalinity is too high, the slag viscosity is not suitable for the cause of pits. Welding heat input is small, but also prone to weld forming poor surface of the phenomenon of pits.
9. Not soldered
Welding speed is too large or large gap when the groove is small, unstable welding parameters and so on.
10. Collapse
Weld pads and steel plate in contact, welding current is too large or too small welding speed.
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