LF6防锈铝与HR-2抗氢不锈钢摩擦焊接

Friction welding of LF6 anti-rust aluminum and HR-2 anti-hydrogen stainless steel

通过试验研究了铝合金系列含镁量最高的LF6防锈铝与HR - 2抗氢不锈钢异种材料摩擦焊接头的组织与性能 ,探讨了其摩擦焊接性。经焊前对焊接界面的特殊处理 ,清除了LF6与HR - 2待焊接表面上的氧化膜 ,并采用以纯铝为介质的三元摩擦焊接工艺方法 ,避免或减少焊接界面上金属间化合物的生成 ,所焊接制品的抗拉强度可以达到或超过LF6防锈铝母材所要求的供货状态σb≥ 2 70MPa的技术要求。

Good weldability between LF6 alloy and HR-2 steel is very important for the production of the special pressure vessel made up of LF6 alloy sphere and HR-2 steel pipe. In order to improve the welding quality between these two kinds of materials, we explore experimentally the characteristics and mechanical properties of the friction welded joints of LF6 anti-rust aluminum and HR-2 anti-hydrogen stainless steel. Magnesium in LF6 aluminum alloy is easy to form the brittleness intermetallic compounds on the friction welding interface during the friction welding of LF6 and HR-2 steel, which not only leads to bad weldability, but also results in lower strength of the welded joint. In order to solve this problem, a three-body method has been used in experiments. By means of adding pure aluminum film to the friction surface and cleaning oxide films of the friction welding interface of LF6 and HR-2 before welding, the tensile fracture strength of the welded joints can reach or exceed 270 MPa. Adopting the pure aluminum film as intermediate layer during the friction welding of LF6 alloy and HR-2 steel, we can prevent the formation of intermetallic compound on the friction welding interface.