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Welding method for copper and stainless steel

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 Copper and stainless steel can be welded together, belonging to dissimilar metal welding.


1. Use silver solder. Argon arc welding is faster and has a good appearance. The copper tube must be heated to the temperature of the silver solder to stick, and then the welding gun to the stainless steel. Copper stays for a long time, stainless steel stays for a short time and just goes through it quickly.


2, the best way is brazing. Add silver electrode.


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Metal welding is a manufacturing or sculpting process of joining metals together. During welding, the workpiece and solder melt or do not melt, forming a direct joint weld of the material. In this process, pressure is usually applied to join the weldment.


There are more than 40 metal welding methods, which are mainly divided into three categories: fusion welding, pressure welding and brazing welding:


Fusion welding


Fusion welding is a method to heat the workpiece interface to the melting state without pressure during welding. During fusion welding, the heat source will rapidly heat and melt the interface of the two workpiece to be welded to form a molten pool. The molten pool moves forward with the heat source, forming a continuous weld after cooling and connecting the two workpieces into one.


During fusion welding, if the atmosphere is in direct contact with the hot pool, the oxygen in the atmosphere will oxidize metals and various alloy elements. Nitrogen and water vapor in the atmosphere entering the molten pool will also form porosity, slag inclusion, cracks and other defects in the weld in the subsequent cooling process, which will deteriorate the quality and performance of the weld.


In order to improve welding quality, various protection methods have been developed. For example, gas shielded arc welding is to isolate the atmosphere with argon, carbon dioxide and other gases, in order to protect the welding arc is not oxidized, to avoid the formation of defects; And such as steel welding, in the electrode skin with a large affinity for oxygen titanium iron powder deoxidation, you can protect the beneficial elements in the electrode manganese, silicon and other elements from oxidation into the molten pool, after cooling to obtain high quality weld.


2. Pressure welding


Pressure welding, also known as solid state welding, is to combine two workpiece atoms in solid state under pressure. The commonly used pressure welding process is resistance butt welding, when the current through the two workpiece connecting end, the part due to high resistance and temperature rise, when heated to the plastic state, under the action of axial pressure connected into one.


The common feature of all pressure welding methods is that pressure is applied during welding without filler material. Most pressure welding methods, such as diffusion welding, high frequency welding, cold pressure welding, do not melt process, so there is no beneficial alloy elements like melt welding burn loss, and harmful elements invade the weld, thus simplifying the welding process, but also improve the welding safety and health conditions. At the same time, the heating temperature is lower than that of fusion welding, and the heating time is shorter, so the heat affected zone is small. Many materials that are difficult to be welded by fusion welding can often be welded by pressure welding into high quality joints with the same strength as the base metal.

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