Work has to deal with a problem, all sorts of problems, such as mechanical fault, the problem of operation, the equipment run slowly, met a fully welded ball valve body, all know welding joint are generally designed for thick wall narrow gap submerged arc welding, we will encounter some difficulties in production, sometimes we have no way to solve, and most of all welded body for large thickness of tubular welded joint. When we had a failure, we thought why? Why this kind of failure, after the failure how to deal with it.

Heat treatment

When we meet with failure will be thinking of heat treatment, we should be how to grasp the emergency measures in the event of a failure, three thick wall type ball valve multilayer welding process is the process of metal material repeated heating and cooling, leading to the nonuniformity of welding joint organization and inferior, produce the high residual stress, and even produce welding defects. Welding is the final process after the product is assembled. There is non-metal sealing material rubber and polytetrafluoroethylene plastic in the valve cavity, which cannot be heat treated after welding.

joint

In the design of the valve body welded joint, a circular assembly gap exists at the root of the weld for alignment and positioning. Under the action of internal pressure and external load, this gap will generate several times of dry normal working stress, which also makes it difficult for engineers to deal with.

Body of the root of the welded joint crack stress concentration, residual stress, chip ball valve is the emphasis in the future we object, many areas need these products, organization of inferior become weak link in the body structure, is attention at home and abroad, but did not see any reports related to solve the problem, become a hidden danger of the boundary of this product structure integrity.

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