Article details
[Phenomenon]
Because it is difficult to fuse the electrode head or iron block with the welded part during welding, it will cause welding defects such as incomplete fusion and incomplete penetration, and reduce the connection strength. If it is filled with rusty electrode heads and iron blocks, it is difficult to ensure that it is consistent with the material of the base metal; if it is filled with electrode heads and iron blocks with oil, impurities, etc., it will cause defects such as pores, slag inclusions, and cracks in the weld. These situations will greatly reduce the quality of the weld seam of the joint, which cannot meet the quality requirements of the design and specification for the weld seam.
[measure]
(1) When the assembly gap of the workpiece is large, but does not exceed the allowable range of use, and the assembly gap exceeds 2 times the thickness of the thin plate or is greater than 20mm, the surfacing welding method should be used to fill the recessed part or reduce the assembly gap. It is strictly forbidden to use the method of filling the welding rod head or iron block to repair the welding in the joint gap.
(2) When parts are processed and marked, attention should be paid to leaving enough cutting allowance and welding shrinkage allowance after cutting, and controlling the size of the parts. Do not increase the gap to ensure the overall size.
