电冰箱生产及维修过程中,常发现一些“主漏”、“付漏”产品。由于蒸发器常用铝材制作,用通常的方法往往难以对其进行补焊。氩弧焊虽然能有效地实现铝的焊接,但其设备昂贵,而且在冰箱维修这一特殊现场,很多位置不便施焊。因此,冰箱生产厂家和维修单位在处理这类产品时,大都采用更换新的蒸发器的办法。这样显然很不经济,而且很麻烦。经过试验,可以采用硬钎焊办法进行维修。硬钎焊的焊接头抗腐蚀性能强,接头强度能达58.8～78.4×10~6牛/米~2,完全可以满足冰箱的要求。但铝是很活泼的金属,极易生成致密的高熔点Al_2O_3膜,如工艺选用不当,往往难以达到预期的目的。其工艺方法: 1.材料钎料采用料403,钎剂为刘201,这两种材料均为湖南大学研制的新型铝钎料和钎剂。 1.焊前的准备先用砂布仔细清理表面的泡迹及氧化膜,然后用 Refrigerator production and maintenance process, often found some “main drain”, “pay leakage” products. As the evaporator commonly used aluminum production, with the usual method is often difficult to repair welding. Although argon arc welding can effectively achieve the aluminum welding, but its equipment is expensive, but also in the refrigerator repair this special site, many places inconvenience welding. Therefore, refrigerator manufacturers and maintenance units in the treatment of such products, mostly used to replace the new evaporator approach. This is obviously very uneconomical, and very troublesome. After testing, brazing methods can be used for maintenance. Brazed welded joints strong corrosion resistance, joint strength can reach 58.8 ~ 78.4 × 10 ~ 6 N / m ~ 2, fully meet the requirements of the refrigerator. However, aluminum is a very lively metal, which can easily form a dense high-melting Al 2 O 3 film. If the process is improperly selected, it is often difficult to achieve the desired purpose. The process method: 1 material solder material 403, flux 201, these two materials are developed by Hunan University, a new type of aluminum brazing filler metal and flux. 1. Preparation before welding Use emery cloth carefully clean the surface of the bubble and oxide film, and then use