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Technology of gas welding of copper

The most common way to weld copper products is with acetylene. With its help, temperatures necessary for the formation of a quality weld are reached in the area of the weld. To make the welding process stable, it is necessary to observe the following rules:

• Exclude conditions under which stable copper oxides will form in the welding area To this end, welding is carried out under a layer of flux;
• As copper has a low heat capacity and high thermal conductivity, in the melting zone of the metal should be concentrated heat power of 5 ... 7 times higher than a similar parameter for gas welding steels;
• Due to the increased linear expansion coefficient of copper, those parts of the product surface that were exposed to the thermal impact of gas accumulate significant thermal stresses. They often cause cracking during cooling of the welded parts;
• Eliminate "overlap" welding, which can lead to a lack of penetration and, as a consequence, to a reduced mechanical strength of the weld.

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Sequence of gas welding copper

Cleaning and dismemberment of edges, in which the parts to be joined are located at a certain distance, which takes into account the fact of thermal expansion of the metal when heated, the choice of welding. With the increase of the speed of the welding torch moving over the surface of the items the risk of cracking decreases, since the maximum temperature difference decreases. The details are preheated briefly by a flame torch, which is located at some distance from the welding area. Welding is carried out under a layer of flux;

Acetylene consumption and weld cleaning

Acetylene consumption depends on the thickness of welded products and varies from 150 ... 160 l/h - for thin parts, up to 180 ... 220 l/h - for thick parts. These standards are given with the assumption that the speed of the torch when welding does not exceed 1 mm / s, and the finished weld cleaned of residual slag, and then forged: this removed welding stress and some grinding grain macrostructure.

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