强制冷却搅拌摩擦焊接工艺

搅拌摩擦焊接在工业生产中应用的主要问题之一,是焊接硬化状态材料时接头强度系数较低.简要分析了焊接热对接头强度的影响,提出了在搅拌摩擦焊接过程中进行强制冷却的工艺方法.对比了强制冷却对紫铜搅拌摩擦焊接头表面状况、硬度分布和接头性能的影响,建立了强制冷却搅拌摩擦焊接过程中焊接区温度的近似表达式.结果表明,在紫铜搅拌焊接过程中进行强制冷却,可以降低焊接过程中焊缝及热力影响区变形金属的温度,减小接头软化的程度和范围,提高搅拌摩擦焊接接头的性能.采用转速1 500 r/min、移动速度0.3 mm/s的强制冷却的工艺方法,得到的紫铜搅拌摩擦焊接头抗拉强度达269 MPa.

Forced cooling frictton stir welding process

The main problem of friction stir welding (FSW) applying in industry is the lower joint strength coefficient as welding work hardened materials. The influence of welding heat on the joint strength was analyzed. The friction stir welding process with forced cooling was researched. The influence of forced cooling on the surface modality, hardness distribution and joint strength of FSW joint of copper plate were compared. The approximate mathematic expression of the temperature during the forced cooling friction stir welding process was built up. The research results show that: the forced cooling during FSW of copper can decrease the temperature of weld zone and heat-mechanical affected zone during welding, minimize the soft zone width and weak degree, and increase the properties of FSW joint. With the optimized rotary speed 1 500r/min, moving speed 0.3 mm/s, and forced cooling, the tension strength of copper welded joint is 269 MPa.