- Heat treatment technology treatment
The thick-walled multi-layer welding process is a process in which metal materials are repeatedly heated and cooled many times, resulting in uneven and inferior quality of the welded joint structure, high residual stress, and even welding defects. Welding is the last process after assembly of this product. There are non-metallic sealing materials rubber and polytetrafluoroethylene plastic in the valve cavity, and post-weld heat treatment cannot be performed.
- Joint processing
In the design of the valve body welded joint, there is an annular assembly gap at the root of the weld for alignment and positioning. Under the action of internal pressure and external load, this gap will produce a stress concentration several times the normal working stress. Similarly Make it difficult for engineers to deal with.
The stress concentration, residual stress, and tissue deterioration in the root gap of the valve body welded joint have become weak links in the valve body structure. This has attracted the attention of the valve industry at home and abroad, but there are no relevant reports on solving this problem. This product has become A hidden danger to the integrity of structural boundaries.
