The fastenings manufacturer tells you that during the welding process of steel structural bolts, due to the unevenness of heating and cooling, as well as the constraints or additional constraints of the components themselves, after the welding work is completed, welding stress will always be generated in the components. The fastenings manufacturer tells you that the existence of welding stress in the component will reduce the actual load-bearing capacity of the welded joint area, produce plastic deformation, and in severe cases, it will also lead to the destruction of the component.
The fastenings manufacturer tells you that the post-welding hydrogen elimination treatment refers to the low-temperature heat treatment performed after the welding is completed, when the weld has not been cooled to below 100°C. The fastenings manufacturer tells you that the general specification is to heat it to 200~350℃ and keep it warm for 2-6 hours. The main function of post-welding hydrogen elimination treatment is to accelerate the escape of hydrogen in the weld and heat-affected zone, which is extremely effective in preventing weld cracks during low-alloy steel welding.
The fastenings manufacturer tells you that the stress relief heat treatment is to reduce the yield strength of the welded workpiece at a high temperature to achieve the purpose of relaxing the welding stress. There are two commonly used methods: one is the overall high temperature tempering, that is, the whole weldment is put into a heating furnace, slowly heated to a certain temperature, then kept for a period of time, and finally cooled in the air or in the furnace. In this way, 80%-90% of welding stress can be eliminated. The fastenings manufacturer tells you that another method is local high temperature tempering, that is, only heat the weld and its nearby area, and then slowly cool it to reduce the peak of the welding stress, so that the stress distribution is relatively smooth, and the purpose of partially eliminating the welding stress.