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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 »
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The welding residual stress is caused by the uneven temperature distribution of the weldment caused by welding, the thermal expansion and contraction of the weld metal, etc., so the welding construction will inevitably produce residual stress. The most common method to eliminate residual stress i...Read more »
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1. The priority principle of arc welding with electrodes For the installation and welding of pipelines whose diameter is not too large (such as below 610mm) and the length of the pipeline is not very long (such as below 100km), electrode arc welding should be considered as the first choice. In...Read more »