钎剂的选择铝波导大面积拼焊时,一般采用氯化物钎剂。由于氯化物钎剂具有强的吸潮性,钎剂残渣水解后的产物与铝母材反应放出少量气体;去膜力差、钎缝致密性不好等缺点,所以焊后夹渣-夹气严重、致密性差,并极易产生侧壁鼓包和电化学反应。采用共品型氟化物钎剂在铝波导大面积拼焊中应用的最大优点是钎剂残渣与铝母材反应 The choice of flux aluminum wave welding large area, the general use of chloride flux. Chloride flux has a strong moisture absorption, flux residue after hydrolysis of the product and the reaction of aluminum base release a small amount of gas; poor film removal, poor brazing seam density and other shortcomings, so slag after welding - folder gas Serious, dense and poor, and prone to the side wall bulge and electrochemical reactions. The use of common-type fluoride flux in the aluminum waveguide welding large area is the biggest advantage of the flux residue and the aluminum base material reaction