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钣金加工中怎样钎焊对接受压铜管

2018-06-01 08:15:10 常州亿创钣金加工厂 阅读

钣金加工中,为了保证小的等直径的薄壁紫铜管焊接接长后,圆管外径保持原来大小,表面光滑,不渗漏,又可以承受很大的工作压力,一般采用“斜对口钎焊”接头形式。

采用这种焊接,主要工艺为:

(1)采用银钎料303,成分为银45%,铜30%余量为锌。钎剂为氯化锌30%,蒸馏水70%。

(2)焊前,先用锉刀将两根铜管的接头端各挫成斜坡,用细纱布仔细打光,用风吹掉铜屑。

(3)采用中性火焰先加热铜管,涂上钎剂,继续加热,待钎剂融化,则说明温度已够,这是就往钎焊面上涂擦银钎料。两根铜管端面因存在很小的间隙,在毛细管作用下,钎料渗入对接表面。为获取表面平整,可用外焰加热一遍,冷却后,形成牢固的钎焊接头。

(4)焊后用砂布去掉接头上的焊渣并修光,使之接头处外径等于圆管外径。

(5)用氯化锌钎剂钎焊后,应立即洗净。

In sheet metal processing, in order to ensure that the small and equal diameter thin-walled copper tubes are welded and long, the outer diameter of the circular pipe keeps the original size, the surface is smooth, no leakage, and it can bear a lot of work pressure, and the "diagonal butt brazing" joint is generally adopted.

The main process is to adopt this kind of welding.

(1) silver solder 303, silver 45% and copper 30%. The brazing agent is 30% zinc chloride and 70% distilled water.

(2) before welding, use the file to slit the ends of the two copper tubes into a slope, use the fine gauze to polish them carefully, and blow off the copper scraps with the wind.

(3) a neutral flame is used to heat the copper tube first, and the brazing agent is applied to continue to be heated and the flux is melted, which indicates that the temperature is enough, and this is to rub the silver solder on the brazing surface. Because there is a small gap between the ends of the two copper tubes, the filler metal penetrated into the butt surface under capillary action. In order to obtain surface flatness, it can be heated by external flame and cooled to form a solid brazing joint.

(4) after welding, remove the welding slag from the joint and repair it with abrasive cloth, so that the outer diameter of the joint is equal to the outside diameter of the tube.

(5) after brazing with zinc chloride brazing flux, it should be washed immediately.


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