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Performance factors affecting welded joints
- 2019-07-02-
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Welded joints are joints where two or more parts are to be welded together. Or a joint that joins two or more parts by welding, including welds, fusion zones, and heat affected zones. The welded welded joint is formed by local heating by a high temperature heat source. Welded joints consist of weld metal, fusion zone, heat affected zone and base metal. The mechanical function of the welded joint is determined by its chemical composition and arrangement. Thus, factors affecting the chemical composition of the weld and the arrangement of the welded joint affect the function of the welded joint. Welded pipe joints are suitable for medium: oil, water, gas and other non-corrosive or corrosive media. For welded sealed pipe joints, the specifications of the steel pipe are more sensitive, and after welding with the pipe, it has a firm connection. Good sealing function and so on. Therefore, it is widely used in refining, chemical, light industry, textile, national defense, metallurgy, aviation, ship and other systems; it is also applicable to various hydraulic engineering pipelines such as mechanical engineering and machine tools. When the production of the ferrule joint is not enough, and in the case of strong corrosion, it is preferred. Welding materials
Welding electrodes for manual arc welding, submerged arc active welding and gas maintenance welding, etc., become part of the weld metal after melting, directly affecting the chemical composition of the weld metal. Flux also affects the chemical composition of the weld. Soldering method The heat source of the different welding methods differs in temperature unevenness and heat concentration. Therefore, the thickness of the heat-affected zone and the size of the welded joint arrangement are different, and the function of the joint is different. In addition, different welding methods have different mechanical maintenance effects. Therefore, the purity of the weld metal, that is, the content of harmful impurities, the function of the weld will be different. Welding Process When welding, the general name of the physical quantity (such as welding current, arc voltage, welding speed, line energy, etc.) selected to ensure the welding quality is called the welding process parameter.