What is the quality standard of solder joints in the welding of metal stamping parts?
In the processing of metal stamping parts, some small parts need to be welded to be formed. What are the quality requirements and standards for the solder joints during welding? Let’s briefly talk about spot welding; 1. First look at the appearance quality of the solder joints. , The surface of the solder joints is round or elliptical, and the number, location, and size of the solder joints should meet the requirements of the product process and drawings. The solder joints should be visually free of cracks, pores, desoldering, overburning, burning through, etc.; 2 , Depth of indentation; not more than 20% of the thickness of the plate. If the thickness ratio of the two workpieces is greater than 2:1, the depth of indentation can be increased to 20%~25%, and any indentation should be polished; 3. Straight line of solder joints Degree: the difference between the straightness of the welding point and the left and right displacement is not more than 3mm; 4. The penetration rate in the welding of metal stamping parts is 30% to 80%; 5. The welding points must be evenly distributed when welding the stamping parts, and the distance between the welding points The difference is ±5mm and must not be accumulated. When the distance of the last solder joint cannot meet the requirements (the distance is too large or too small), it needs to be adjusted to ensure that the solder joints are evenly distributed; 6. The number of solder joints meets the requirements of the 'Welding Standard Operation Guide' for the station. When the number of points on a certain welding edge is 5 or less in the process document, no defective solder joints or few solder joints are allowed. When the number of welding points of a certain welding edge is specified in the process document as 6 or more, the allowable number of defective welding points and the number of excess welding points are shown in the following table: 7. If a welding edge is allowed to have two or more points Defective solder joints, then there should be at least a good solder joint interval between the defective solder joints before it can be regarded as qualified. The solder joints at the end of the weld seam cannot be defective; 8. If an abnormal solder joint is found, the corresponding solder joint Make a record of the abnormal state, and record the result on the inspection record sheet, and implement the welding quality problem handling process; 9. If the defective solder joint exceeds 1% of the total, it is also regarded as unqualified; the article recommends: What are the design principles of the convex and concave mold inlay structure design in the stamping die design? Previous post: What are the design principles of convex and concave die inlay structure design in stamping die design?
