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五十年代初,就有人对焊接接头弯曲试验的目的以及合理性提出异议,至今尚未得到统一。最初,人们用弯曲试验来测定焊接接头的塑性及焊缝与母材的结合强度,因此它被认为是一种机械性能试验方法。在压力容器制造中,筒身和封头需冷卷,冷压或冷冲成形,往往采用弯曲试验来测定焊接接头的冷变形能力,这样它又被作为一种工艺试验方法来应用。然而,在一些焊接工艺评定标准中,基本上将焊接接头的弯曲试验作为一种揭示接头
In the early 1950s, some people objected to the purpose and rationality of the bending test of welded joints, which has not yet been unified. Initially, bending tests were used to determine the plasticity of a welded joint and the bond strength of the weld to the parent material, so it is considered a mechanical property test method. In the pressure vessel manufacturing, the body and the head to be cold rolled, cold or cold-formed, often using the bending test to determine the cold deformation of welded joints, so it has been used as a test method of technology. However, in some welding process qualification standards, the bend test of welded joints is basically used as a way of revealing joints