Maijin is specialized in all various custom-made CNC machining parts and CNC milling parts as well as non standard fasteners.
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Maijin is specialized in all various custom-made CNC machining parts and CNC milling parts as well as non standard fasteners.
Steel structure bolts | In the welding process, due to the unevenness of heating and cooling, and the constraints caused by the components themselves or additional constraints, welding stress will always be caused in the components after welding. The occurrence of welding stress in the component will also reduce the specific bearing capacity of the welded joint area, resulting in shape changes, and in severe cases, it will also cause the destruction of the component. The post-weld hydrogen elimination solution refers to the ultra-low temperature heat treatment process performed after the welding is completed and the welding is not cooled below 100°C. The general standard is to heat up to 200~350°C and keep the heat for 2-6 hours. The important function of hydrogen elimination after welding is to accelerate the escape of hydrogen in the welding and heat-affected zone, and the effect of avoiding welding cracks after welding of high-alloy steel is extremely obvious. Maijin stress relief heat treatment process is to reduce the tensile strength of the welded product workpiece under high temperature conditions, so as to achieve the effect of relaxing welding stress. There are two common methods: one is overall continuous high-temperature tempering, which refers to putting the weldment into the heat treatment furnace as a whole, slowly heating it to a certain ambient temperature, and then insulating it for a period of time, and then cooling it in the air or in the furnace. This method can remove 80%-90% of welding stress. Another method is partial continuous high-temperature tempering, that is, only heat the welding and surrounding parts, and then cool slowly to reduce the higher value of welding stress, make the stress distribution more gentle, and have the effect of partially removing welding stress.
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Email: mj@chinamaijin.com
10F, 9 Building Block B, Bao Neng Science and Technology Park, NO.1 Qing Xiang Rd, Long Hua District, Shen Zhen City, China.
