Problems with test plates for cold-pressed end caps manufactured by forming first and then welding
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For cold-pressed heads that are formed first and then welded, with a deformation rate greater than 5%, a heat-treated test plate of the base material is required, but no welding test plate for the actual product is needed. Why?
For heat treatment required to restore properties after cold forming, a base material heat treatment test plate shall be prepared. After segment forming, the parts are welded together; since the welds do not require heat treatment to restore their properties, there is no need to prepare welding test pieces of the product in order to evaluate the impact of heat treatment on the weld properties. However, whether it is necessary to prepare welding test plates for the welding of split-end heads should also be determined by taking into account the operating conditions of the equipment itself as well as the specific conditions of the head welds.