Resistance Welding Defects about Wire Baskets
Datetime:2016-09-09 Hits:
Let’s continue the last topic we talked yesterday.
3: Cracks in the Weld Area of Mesh Baskets
Too much pressure may reduce weld heat, but too little pressure also creates problems. When there isn’t enough pressure from the weld electrodes at the weld site, the welded joint may become porous or even show signs of cracking.
Cracks at the site of a spot weld may indicate a low tensile strength for the weld, as the two pieces of metal weren’t properly joined.
4. Asymmetrical Spot Weld Marks
The vast majority of the time, a well-executed resistance spot weld mark should have a perfectly round shape, or at least conform to the shape of the welding heads used to join the two pieces of metal.
Shapes that are asymmetrical indicate imperfections in the weld, such as misaligned electrodes or the presence of foreign contaminants at the weld site. This creates a weaker weld that will be more likely to break under pressure.
5: Expulsion of Metal Near Weld Site
Molten metal seeping from the area where two pieces of metal are joined can indicate any number of problems with the weld, such as:
Insufficient weld pressure;
Mistiming of the weld;
Surface contamination.
At any rate, the presence of molten metal coming from under a weld joint can be an indication of a weak weld.
There are other signs of poor-quality welds to look out for in wire baskets, such as severe scorch marks or physically-distorted parts, but these marks are often easy to spot right away compared to the ones in this list.
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