08 Jan,2024
Tip：How to determine the dry stretch length of welding wire?
The dry stretch length of MIG welding is equal to the distance between the conductive nozzle and the workpiece minus the arc length. In the case of a certain arc voltage, the distance between the conductive nozzle and the workpiece is determined, and the dry stretch length of the welding wire is naturally determined.
The wire used for short-circuit transition gas protection welding is very thin, so the dry stretch length of the wire has a great influence on the droplet transition, arc stability and weld formation. When the dry elongation is too large, the resistance heat increases, and the welding wire is easy to fuse due to overheating, resulting in serious splashing and arc instability. In addition, when the dry elongation is too large, the actual welding current decreases, and the penetration ability of the arc decreases, which easily leads to non-penetration. When the dry elongation is too small, the distance between the nozzle and the workpiece is very small, and the splashing metal particles are easy to block the nozzle.
When short-circuit transition gas shielded welding, the dry stretch length should generally be controlled at 8~12mm.
The wire used for the fine particle transition gas protection welding is thicker, and the dry stretch length of the wire has less influence on the droplet transition, arc stability and weld formation than the short circuit transition. However, due to the large splash, the nozzle is easy to block, so the dry stretch length should be larger than the short-circuit transition, and it should generally be controlled at 10~20mm.
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