HEBEI XINYU WELDING CO., LTD.

Reasons of Shape Defects of Submerged Arc Welded Joints

Nov. 19, 2016

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.

If you need sub arc wire and flux, you can contact us at your any time.