论文部分内容阅读
在手工电弧焊工(以下称电焊工)的考试工作中,冷弯背弯试验是按1980年国家劳动总局关于《锅炉压力容器焊工考试规则》进行的,有不少电焊工达不到合格标准。试样背弯裂纹超标的原因,对A_3钢来说,有以下两方面: 1、根部焊缝缺陷引起背弯裂纹焊完经表面及内部检验合格的试件,经机加工冷弯,背弯不合格率达60%以上,而面弯合格率在95%以上。冷弯试验对焊缝内、外部的各种缺陷是很敏感的,面弯合格率大大地高于背弯合格率,说明问题就出在焊缝的根部上。在同一块经x射线检验合格的试板上,按《考
In the manual arc welder (hereinafter referred to as welder) test work, cold bend back bend test is based on the 1980 State Administration of Labor on “Boiler and Pressure Vessel Welder Examination Rules”, there are many welders can not meet the eligibility criteria. Reasons for excessive specimen back-crack crack, the A_3 steel, the following two aspects: 1, the root weld defects caused by back-bending crack welding After the surface and internal inspection of qualified specimens, the machined cold bend, back bend Failing rate of 60% or more, while the face-bending pass rate of 95% or more. Cold-bend test on the weld, the external defects are very sensitive, face bend pass rate is much higher than the back-bend pass rate, indicating that the problem lies in the root of the weld. In the same piece of x-ray test panels, according to "test