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气体保护钎焊应用虽然很广,但有时即使采用纯度很高的还原性气体通入钎焊炉中,仍不能保证得到适当的保护环境。例如采用氢气在温度1160℃用纯铜钎焊不锈钢,在加热过程中通过低于氧化物还原的温度范围时,不锈钢发生氧化。另外,如果加热速度过慢,则形成大量的氧化物,要还原这些氧化物必须有足够温度和时间。同时,含氧的铜基或银基钎料能使不锈钢零件周围的氢气严重污染,致使焊件上面形成很厚的绿色氧化物。在这种情况下,焊缝多半会变脆和出现
Although a wide range of gas brazing applications, sometimes even the use of highly pure reducing gas into the brazing furnace, can not guarantee the proper protection of the environment. For example, hydrogen is used to braze stainless steel with pure copper at a temperature of 1160 ° C, and the stainless steel is oxidized when it passes through a temperature range lower than the oxide reduction during heating. In addition, if the heating rate is too slow, a large amount of oxide is formed, and it is necessary to have sufficient temperature and time to reduce these oxides. At the same time, oxygen-containing copper-based or silver-based brazing filler metal can cause serious pollution of hydrogen around the stainless steel parts, resulting in the weldment to form a thick green oxide. In this case, most of the welds will become brittle and appear