Pneumatic valve surfacing welding piece why need to heat treatment after welding

pneumatic valve production process knows that, in the pneumatic valve production, there is a process called seal welding, improve the sealing surface wear resistance, impact resistance and corrosion resistance. But why need pneumatic valve surfacing welding parts after welding heat treatment? We ( Guangzhou cranes pneumatic valve industry) Here to explain the reason, is not the right place, welcome to correct.
in the pneumatic valve sealing surface surfacing conform to the requirements of the using performance of alloy, the sealing surface of surfacing welding alloy parts called surfacing. Pneumatic valve sealing surface proper heat treatment after welding is necessary. Because when the pneumatic valve sealing surface surfacing inevitably produce welding stress, if not eliminated, will cause a series of problems, serious when will affect the quality of the pneumatic valve.
in the manufacturing process, can lead to welding crack, and affect the mechanical processing smoothly. In the process of pneumatic valve to deposit, because the natural role of stabilizing treatment will cause sealing surface deformation, lead to seal test of pneumatic valves, leakage, serious when still can produce cracks, even make the parts scrap.
cryogenic pneumatic valve under the effect of temperature, the austenite stainless steel parts can increase the amount of martensitic transformation, resulting in a low temperature toughness.
so, formation of surfacing welding sealing surface according to pneumatic valves conditions of use matrix surfacing materials and sealing materials, parts, and connecting with the manufactory process conditions, select the appropriate heat treatment process. This to improve the quality of pneumatic valves and service life is very necessary. General welding with stress tempering annealing or go.