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  • All-welded ball valve body technical processing
    Jan 16, 2018

    All-welded ball valve body, welded joints are generally designed to narrow gap thick-walled submerged arc welding, the valve body are mostly thick cylindrical welding joints. There are two main reasons:

    1: Joint processing

    In the design of the valve body welded joints, there is a ring-shaped assembly gap at the root of the weld for alignment and positioning. This gap will produce several times the stress concentration of the normal working stress under internal pressure and external load. Similarly Make engineers difficult to handle.

    Valve body welded joints at the root of the gap stress concentration, residual stress, poor organization become the weak link in the valve body structure for the valve industry at home and abroad attention, but there is no any report to solve this problem, to become the product A hidden danger of the integrity of structural boundaries.

    2: heat treatment technology

    Thick-walled multi-layer welding process is a metal material repeated heating and cooling process, resulting in welded joints of the organization of non-uniformity and poor quality, resulting in higher residual stress, and even weld defects. Welding is the final assembly of the product after the process, the valve cavity with non-metallic rubber seal material and PTFE plastic, can not be post-weld heat treatment.