Weld repair has the following situations:

1. If the fillet weld foot size is relatively small, multi-layer multi-pass welding can be adopted, just like the swallow base, from the bottom up, layer by layer to the size requirements.

2. If the fillet weld is small, less than 4-7mm, and the size of the welding foot is insufficient, it is necessary to plane or grind it off and reweld it.

3. If there are welding defects (pores, slag, cracks and non-penetration defects) in the welding seam, the defects shall be cleaned up, and the butt joint shall be regroove, and then the welding shall be conducted.When opening the groove, pay attention to the groove Angle of 60 degrees, groove surface to clean out the metal luster, avoid sharp Angle, if necessary (cast iron welding) to stop the hole.

4, when welding, pay attention to the thickness of the welding can not exceed 3-5mm, clean between layers.