Using the resistance seam-welding (RSEW) process to make gas-tight seals involves making a series of overlapping spot welds. Each spot must be a fully formed nugget-free of expulsion. Insufficient heat produces undersized spots and can cause leaks. Excess heat produces expulsion, which also can cause leaks. In addition to controlling nugget formation, the process requires consistent spot spacing to ensure proper nugget overlap.
展开▼
