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No matter where the welding joint is, it is actually an accumulation of welding experience. For novices, simple positions are the basic exercises, starting with rotations and moving on to fixed positions. Rotation welding corresponds to fixed welding in pipeline welding. Fixed welding means that ... Read more »
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Spot welding is a resistance welding method in which the weldment is assembled into a lap joint and pressed between two electrodes, and the base metal is melted by resistance heat to form a solder joint. Spot welding is mainly used in the following aspects: 1. Lap joint of sheet stamping parts,... Read more »
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High-carbon steel refers to carbon steel with w(C) higher than 0.6%, which has a greater tendency to harden than medium-carbon steel, and forms high-carbon martensite, which is more sensitive to the formation of cold cracks. At the same time, the martensite structure formed in the heat-affected ... Read more »
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1. Technical essentials of argon tungsten arc welding 1.1 Selection of tungsten argon arc welding machine and power polarity TIG can be divided into DC and AC pulses. DC pulse TIG is mainly used for welding steel, mild steel, heat-resistant steel, etc., and AC pulse TIG is mainly used for weldin... Read more »
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There are three types of underwater welding: dry method, wet method and partial dry method. Dry welding This is a method in which a large air chamber is used to cover the weldment, and the welder performs welding in the air chamber. Since the welding is performed in a dry gas phase, its safety i... Read more »
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In the welding process, there are many matters needing attention. Once neglected, it may be a big mistake. These are the points you must pay attention to if auditing the welding process. If you deal with welding quality accidents, you still need to pay attention to these problems! 1. Welding con... Read more »
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The energy source of brazing can be chemical reaction heat or indirect heat energy. It uses a metal with a melting point lower than that of the material to be welded as the solder. After heating, the solder melts, and the capillary action pushes the solder into the gap between the contact surface... Read more »
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Knowledge point 1: Influencing factors and countermeasures of welding process quality Process quality refers to the degree of guarantee of product quality in the process of production. In other words, the quality of the product is based on the quality of the process, and it must have excellent pr... Read more »
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1. Reduce stress concentration The stress concentration point of the fatigue crack source on the welded joint and structure, and all means of eliminating or reducing stress concentration can improve the fatigue strength of the structure. (1) Adopt a reasonable structural form ① Butt joints are pr... Read more »
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The submerged arc welding process is the most ideal choice in the important application fields of pipelines, pressure vessels and tanks, track manufacturing and major construction. It has the simplest single wire form, double wire structure, series double wire structure and multi wire structure. ... Read more »