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压力容器焊缝的返修是在产品刚性拘束较大的情况下进行的。返修次数的增多,不但会带来时间和材料的浪费,而且还会造成产品质量的下降,返修次数一般不宜超过两次,因此,必须提高一次返修合格率。我公司承建的丙烯球罐(材质为日本容器用钢SPV36N,壁厚42mm,容积400m~3,焊缝总长260m)共拍片1060张,其中返修片19张。由于采取了相应的措施,使一次返修合格率达100％。现将提高焊缝返修合格率的主要措施介绍如下。 (1)根据现场实际情况,拟定返修工艺,待评定认可后作为返修工作中的指导性文
Rework of pressure vessel weld is carried out under the condition of rigid restraint of product. The increase in the number of rework, will not only bring the time and material waste, but also will result in the decline in product quality, the number of rework generally should not be more than twice, therefore, must improve the rework pass rate. The acrylic spherical tank (made of Japan steel SPV36N, wall thickness 42mm, volume 400m ~ 3, total weld length 260m) constructed by our company has a total of 1060 films, of which 19 are rework films. As a result of the corresponding measures to make a rework qualified rate of 100%. The main measures to improve the weld repair qualified rate are as follows. (1) According to the actual situation on the ground, draw up and rework the craft, after assessing and approving as the instruction text in reworking work