Protection gas brazing

Protection gas brazing is a supplement of vacuum brazing and is always applied when a high-vacuum atmosphere is not suitable for a certain brazing operation. This is the case for bulk materials or filler metals being made of elements with a very high vapour pressure.
A common application is the high-temperature brazing of copper parts. At temperatures above 1000°C copper tends to evaporate under high vacuum conditions. By using a protection gas atmosphere (Argon, Nitrogen e.g.) this undesired effect can be excluded.

The water tubes made of copper with stainless steel fittings are a typical application example. At brazing temperature of 1040°C an Argon-atmosphere prevents massive evaporation of the copper.

Water tubes Material: OF-copper, stainless steel Filler metal: high-temperature alloy Atmosphere: argon