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冰箱压缩机壳体的组装焊接中,机壳与紫铜管是焊接在一起的。机壳采用08A1深冲板(或08F),因拉伸后内应力大,且因含合金元素A1,若采用大参数焊接可能在机壳近缝区产生渗透裂纹,因此必须采用小参数焊接。加热温度控制在800℃以下。由于紫铜管的熔点,导电性和线膨胀系数等热物理性能与机壳的差异,使其焊接性变差。紫铜管与机壳的焊接,要求焊缝成形美观,疲劳强度高,气密性好,为达此目的,现选用中温钎焊工艺,具体介绍如下。
Refrigerator compressor shell assembly welding, the shell and the copper pipe is welded together. The cabinet is made of 08A1 deep drawing plate (or 08F). Due to the large internal stress after drawing and the alloy element A1, if the welding with large parameters may cause penetration cracks in the near-shell area of the casing, welding with small parameters must be adopted. Heating temperature controlled below 800 ℃. Due to the melting point of copper tubes, electrical conductivity and linear thermal expansion coefficient of thermal properties and the difference between the chassis, making it less weldability. Copper tube and the shell of the welding requires beautiful weld appearance, high fatigue strength, air tightness, for this purpose, are now selected brazing process, the specific introduction is as follows.