Can copper and steel be welded?

According to the Practical Welding Process Manual (2nd Edition) edited by Wang Hongguang, Wu Zhongping and Xu Ying, copper and steel can be welded. It's just that copper and steel have different heating characteristics, so welding will be more difficult.

The main difficulty in welding steel and copper is that cracks are easy to occur in the weld and fusion zone. Practice has proved that in order to ensure the high crack resistance of weld, the mass fraction of iron in weld should be controlled at 10% ~ 43%.

Welding methods and welding materials When welding low carbon steel and copper, manual arc welding, submerged arc welding and TIG welding can be used respectively.

When low carbon steel is welded with pure copper, pure copper is used as a filler metal material, such as covered electrode TCU (T107); Silicon manganese bronze QSi3- 1 welding wire is used for TIG welding. When welding low carbon steel with silicon bronze and aluminum bronze, aluminum bronze can be used as filler metal material.

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Classification of welding

Metal welding can be divided into fusion welding, pressure welding and brazing according to the characteristics of its technological process.

In the welding process, if the atmosphere is in direct contact with the high-temperature molten pool, the oxygen in the atmosphere will oxidize metals and various alloy elements.

Nitrogen and water vapor in the atmosphere enter the molten pool, and defects such as porosity, slag inclusion and cracks will also be formed in the weld during the subsequent cooling process, which will worsen the quality and performance of the weld. In order to improve the welding quality, people have developed various protection methods.

For example, gas shielded arc welding is to isolate the atmosphere with argon, carbon dioxide and other gases to protect the arc and molten pool rate during welding; For example, when welding steel, adding titanium iron powder with high affinity for oxygen to covered electrode coating for deoxidation can protect beneficial elements manganese and silicon in covered electrode from being oxidized and entering the molten pool, and obtain high-quality weld after cooling.

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