软钎焊,俗称为锡焊,在机械制造尤其在仪器仪表制造业中应用很广。但这种钎接方法亦有其不足之处:①焊接时,要求工件表面十分清净,不能有氧化膜,否则,难以“上锡”,往往容易出现假焊与脱焊;②为了除去工件表面的氧化膜,常常用氯化物及氟化物。这类物质有良好的除锈作用,但在受热时会产生有刺激性的毒性气体,而且对焊接接头有腐蚀作用。因此,常规的软钎焊接头强度低,寿命短,可靠性差,是仪 Soldering, commonly known as soldering, is widely used in machine construction, especially in instrumentation. However, this brazing method also has its shortcomings: ① welding, the workpiece surface is very clean, can not have oxide film, otherwise, difficult to “solder”, often prone to false welding and desoldering; ② In order to remove the workpiece surface Oxide film, often with chloride and fluoride. Such substances have a good rust, but when heated will produce irritating toxic gases, but also on the corrosion of welded joints. As a result, conventional solder joints have low strength, short life, and poor reliability