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Is Spot Welding Machine Resistance Welding
Dec 12, 2018

Is spot welding machine resistance welding? Spot welding machine is sometimes a kind of resistance welding, so what is resistance welding, is the main welding method of pressure welding. After assembling the fittings, spot welding machine uses the resistance heat generated by the current passing through the contact surface of the joint and the adjacent area to carry out the welding by applying pressure to the electrodes. What are the characteristics of spot welding machine? The main reason is that the welding voltage is very low and the welding current is very large. It takes a very short time to complete a joint welding, so the production efficiency is very high. However, when heated, mechanical pressure is applied to the welded joints, and the joints are welded under the action of pressure. No additional filler metal is needed during welding. Spot welders are also widely used, especially in the manufacture of automobiles and aircraft. There are at least millions of welding joints on new airliners. Resistance welding is widely used in spacecraft, semiconductor devices and integrated circuit components. Therefore, resistance welding is one of the important methods of welding. So resistance welding can be divided into spot welding, seam welding and butt welding according to different technology. But what needs to be emphasized here is that spot welding of spot welder spot welding is a method of resistance welding of welding parts assembly joints, which is pressed between two electrodes and melts base metal by resistance heat to form welding joints. Spot welding is mostly used for the connection of thin plates, such as aircraft skin, aeroengine smoke canister, automobile cab housing, etc. (1) The main components of spot welding machine include frame, welding transformer, electrode and electrode arm, pressure mechanism and cooling water circuit. Welding transformer is spot welding electrical appliances, and its secondary circuit has only one loop. The upper and lower electrodes and the electrode arm are used for conducting welding current and transmitting power. Cooling water passes through transformers, electrodes and other parts, so as to avoid heating and welding, cooling water should be connected first, and then power switch should be connected.  The quality of electrodes directly affects the welding process, welding quality and productivity. Electrode materials are usually made of copper, cadmium bronze, chromium bronze, etc. The shapes of the electrodes are various, which are mainly determined by the shape of the welding parts. When installing the electrodes, attention should be paid to keeping the surface of the upper and lower electrodes parallel; the surface of the electrodes should be kept clean, and the surface of the electrodes should be trimmed with sand cloth or file. (2) Spot welding process(2) Spot welding process_Spot welding process is as follows: opening cooling water; cleaning the surface of welded parts and accurately assembling them, feeding them into the upper and lower electrodes, applying pressure to make them in good contact; heating the contact surface of two workpieces by electrification, local melting, forming a nugget; keeping pressure after power failure, making nugget cool and solidify under pressure; removing pressure and taking out the nugget. Workpiece. The welding parameters such as welding current, electrode pressure, electrification time and electrode working surface size have a great impact on the welding quality.