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一些高压油开关和其它导电接点,由于操作频繁或故障造成其动、静触头的严重烧损,为了解决这一问题,我们把原来的铜触头改为银钨合金(Ag60～70％、W40～30％)触头。由于银钨触头是经粉末冶金制成的,熔点很高,具有抵抗电弧烧灼的能力。该触头是利用氧乙炔银钎焊固定到高压油开关上,具体工艺如下。 1.钎前准备钎焊前应将银钨合金触头和导电杆用细砂布打磨干净,除去油污。 2.钎烬操作 (1)用氧乙炔焰中性焰加热被钎焊的银钨触头,当温度升到100℃左右时,立即用焊丝
Some high-pressure oil switches and other conductive contacts, due to frequent or malfunctioning caused by the dynamic and static contact of the serious burning, in order to solve this problem, we changed the original copper contacts to silver-tungsten alloy (Ag60 ~ 70% W40 ~ 30%) contacts. As the silver-tungsten contact is made of powder metallurgy, the melting point is high, with the ability to resist arc burning. The contact is the use of silver oxyacetal silver brazing fixed to the high-pressure oil switch, the specific process is as follows. 1. Brazing before brazing should be silver tungsten alloy contacts and conductive rod with a fine abrasive cloth polished to remove oil. 2. Brazing ember operation (1) with oxyacetylene flame neutral flame brazed silver tungsten contact, when the temperature rose to about 100 ℃, immediately with a wire