瞬时液相扩散焊接技术在低碳合金钢管对接焊中的应用

Application of Transient Liquid Phase Bonding Technology in Butt Welding of Low Carbon Alloy Steel Tubes

为解决低碳合金钢管的管-管对接技术问题,提高其接头性能,利用自主研发的焊接设备,采用FeNiCrSiB作为中间层,应用瞬时液相扩散焊技术(TLP),进行低碳合金钢管的管-管对接焊工艺研究。结果表明:通过调整焊接温度、焊接压力、保温时间等参数,TLP对接焊接头一次成形良好,焊缝组织无脆性相的生成,中间层也无残留的痕迹,焊缝组织与母材组织相同且界限不明显。利用TLP技术焊接完成的低碳合金钢管,其接头强度、塑性均能满足管-管对接要求。

To solve the technical problems in low carbon alloy steel tube butt welding and improve the performance of the joint, a study on butt welding technology for low carbon alloy steel tube is carried out by using a self-developed welding machine, using FeNiCrSiB as the middle layer and applying the transient liquid phase bonding （TLP） technique. The study shows that by adjusting the parameters such as welding temperature, welding pressure and holding time etc., a TLP butt joint can be well formed in one time with no brittle phase generated in the weld structure and no residual marks in the middle layer, so the weld structure is as same as that of the base metal with no obvious boundary. The joint strength and the plasticity of the low carbon alloy steel pipe welded by TLP technique can both meet the requirements for the tube to tube joint.