Article
Theoretically, almost all steel and non-ferrous metals areflash butt welding, but to obtain high-quality joints, Xinxing Welding recommends based on the relevant characteristics of the metal,Take necessary process measures.
(1) Electrical and thermal conductivity For metals with good electrical and thermal conductivity, shorter welding time, larger power and faster flash speed should be used.
(2)High temperature strength For metals with high temperature and strength, the width of the plastic zone should be increased and a larger upsetting force should be used.
(3) Crystallization temperature range, The larger the crystallization temperature zone and the wider the semi-melted zone, the larger the upsetting pressure and upsetting allowance should be used to squeeze out all the molten metal in the semi-melted zone to avoid defects such as shrinkage cavities, looseness and cracks left in the joint.
(4) Thermal sensitivity There are two common situations. The first is quenched steel. After welding, the joint is prone to quenching structure, which increases the hardness and reduces the plasticity. In severe cases, quenching cracks will occur. Quenched steel usually uses preheated flash butt welding with a wide heating zone, and measures such as slow cooling and tempering are used after welding. The second type is metals that have been strengthened by cold work (such as austenitic stainless steel). During welding, the joints and heat-affected zones soften, reducing the strength of the joints. Welding such metals usually uses faster flash speeds and larger upsetting pressures to minimize the softening zone and reduce the degree of softening.
(5) Oxidizing property Oxide inclusions in joints have serious harm to joint quality. Therefore, preventing and eliminating oxidation is the key to improving joint quality. The composition of metals is different, and the generation of their oxidation properties is also different. If the melting point of the generated oxide is lower than that of the metal to be welded, the oxide will have better fluidity and will be easily expelled during upsetting. If the melting point of the generated oxides is higher than that of the metal to be welded, such as silicon 02, Al203, Cr203, etc., they must be discharged when the metal to be welded is still in a molten state. Therefore, when welding alloy steel containing more silicon, aluminum, chromium, and other elements, strict process measures should be taken to completely eliminate Remove oxides.
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