Improving Joint Properties of Friction Welded Joint of High Tensile Steel
Improving Joint Properties of Friction Welded Joint of High Tensile Steel
复制标题
DOI：
10.1299/jsmea.48.399
复制
发表时间：
2005-10
期刊：
影响因子：
--
通讯作者：
M. Kimura;M. Kusaka;K. Seo;A. Fuji
中科院分区：
文献类型：
--
作者：
M. Kimura;M. Kusaka;K. Seo;A. Fuji
本文介绍了780MPa级高强钢摩擦焊接接头接头性能的改善。传统的连续驱动摩擦焊机焊接接头在施加锻造压力的情况下，焊接效率仍不能达到100%。这是由于焊接界面区软化的热量输入在制动时间。因此，我们开发了一种带电磁离合器的连续驱动摩擦焊机，以防止制动时的热量输入。我们提出的工艺为“低热输入摩擦焊接法（LHI方法）”。在这种情况下，当摩擦力矩达到初始峰值力矩时，接头的抗拉强度与母材相同。也就是说，尽管焊接界面附近存在一个略微软化的区域，但仅使用摩擦阶段（直至初始峰值扭矩）而不使用锻造（镦粗）阶段，焊接接头获得了100%的接头效率。在初始峰值扭矩下施加锻造压力时，该接头几乎不会产生软化区。综上所述，仅通过LHI方法的摩擦阶段制成的高强度钢焊接接头具有优异的接头性能。对于超细晶粒钢等传统熔焊工艺难以连接的材料，LHI方法具有许多优点。
This report describes the improvements in the joint properties of friction welded joint of 780MPa class high tensile steel. Welded joint made by a continuous drive friction welding machine, the conventional method, had not obtained 100% joint efficiency despite applying forge pressure. This was due to the softening of the welded interface zone for heat input during braking times. Therefore, we developed a continuous drive friction welding machine with an electromagnetic clutch to prevent heat input during braking time. We proposed the process as “The Low Heat Input Friction Welding Method (the LHI method).” In this case, the joint had the same tensile strength as the base metal at friction time when the friction torque reached the initial peak torque. That is, the welded joint obtained 100% joint efficiency by using only the friction stage up to the initial peak torque without the forge (upsetting) stage, despite the existence of a slightly softened region adjacent to the welded interface. Furthermore, the softened region was hardly generated when this joint was made by applying forge pressure at the initial peak torque. In conclusion, a welded joint of high tensile steel made by only the friction stage of the LHI method had excellent joint properties. The LHI method has a lot of advantages for joining such materials as super fine grain steel with which conventional fusion welding processes have difficulty.