Spiral Pipe Heat Treatment Process
In the screw steel tube feeding unit, the rolled strip steel is gradually rolled up to form an open circular pipe gap, the extrusion roll is reduced and adjusted, the weld gap is controlled at 1-3mm, and the weld end face is flush.
1. If the gap is too large, resulting in reducing the proximity effect, eddy current lack of heat, weld crystal combined indirect adverse arising from lack of fusion or cracking.
2. The gap is too small, causing the proximity effect increases, excessive soldering heat, cause weld Burning; weld or extruded, rolled after the formation of the pit, affecting the quality of the weld surface.
After the two edges of the tube is heated to welding temperature in the extrusion of squeeze rollers, spiral pipe to form a common metal grain mutual penetration, crystallization, eventually forming a strong weld. If the spiral pipe extrusion pressure is too small, the number of co-crystal formation is small, the weld metal strength is reduced by the force will produce cracking; if the pressing force is too large, will make the molten metal is extruded weld, not only reduces the wel
1. If the gap is too large, resulting in reducing the proximity effect, eddy current lack of heat, weld crystal combined indirect adverse arising from lack of fusion or cracking.
2. The gap is too small, causing the proximity effect increases, excessive soldering heat, cause weld Burning; weld or extruded, rolled after the formation of the pit, affecting the quality of the weld surface.
After the two edges of the tube is heated to welding temperature in the extrusion of squeeze rollers, spiral pipe to form a common metal grain mutual penetration, crystallization, eventually forming a strong weld. If the spiral pipe extrusion pressure is too small, the number of co-crystal formation is small, the weld metal strength is reduced by the force will produce cracking; if the pressing force is too large, will make the molten metal is extruded weld, not only reduces the wel
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