SUMMARY
Besides the welding current, arc voltage, and welding speed, the assembly gap is also crucial in the butt weld, which can directly affect the welding penetration condition. Burn-through defects may occur if the butt gap is increased to a critical value even with the same welding heat input. At the production site, the reserved butt joint gap is more likely to be affected by welding deformation, fixture accuracy, and the site environment. Huang et_al implemented 2 of 13 laser-MIG welding of a low-alloy high-strength steel sheet with a 1 mm butt gap and . . .
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