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中、大壁厚钢管焊接热影响区的形状像个沙漏,管壁的内外表面热而中部低温会限制焊接最大速度,若简单升高管壁中部温度,则管壁的内外表面会过热,同样会降低焊接质量;另外,管壁内表面过热熔化金属掉入阻抗器,会降低阻抗器的寿命和性能。针对这个焊接难题,对焊接区横向温度分布的影响因素———V形角、感应线圈到焊接点的距离、结构应力、焊接速度和焊机功率进行了研究。研究结果表明,较小的V形角可以提高获得更高产量的潜能,从而提高整体焊接效率。
Medium and large thick-walled steel pipe heat affected zone shaped like an hourglass, the inner and outer surface of the tube wall heat and the central low temperature will limit the maximum welding speed, if simply increase the tube wall temperature, the inner and outer surface of the tube wall will be overheated, the same Will reduce the welding quality; In addition, the tube wall surface overheating melted metal dropped into the resistor, will reduce the life of the resistor and performance. In view of this welding problem, the influencing factors of lateral temperature distribution in welding area, such as V-shaped angle, distance from induction coil to welding point, structural stress, welding speed and welding power were studied. The results show that the smaller V-angle increases the potential for higher yields and improves overall welding efficiency.