本文件规定了最小屈服强度高达500 MPa或最小抗拉强度高达570 MPa的非合金钢和细晶粒钢气体保护金属极电弧焊焊态和焊后热处理状态下焊丝和熔敷层的分类要求。可以使用不同的保护气体对一根导线电极进行测试和分类。 本文件构成一个组合规范，使用基于所有焊缝金属屈服强度和平均冲击能量47 J的系统，或使用基于所有焊缝金属抗拉强度和平均冲击能量27 J的系统进行分类- 焊接金属。 a） 带有后缀字母“a”的条款和表格仅适用于根据本文件规定的屈服强度和所有焊缝金属47 J的平均冲击能量分类为系统的焊丝电极。 b） 带有后缀字母“b”的条款和表格仅适用于根据本文件规定的所有焊缝金属的抗拉强度和27 J的平均冲击能量分类为系统的焊丝电极。 c） 没有后缀字母“A”或后缀字母“B”的条款和表格适用于根据本文件分类的所有电线电极。

This document specifies requirements for classification of wire electrodes and weld deposits in the as-welded condition and in the post-weld heat-treated condition for gas shielded metal arc welding of non alloy and fine grain steels with a minimum yield strength of up to 500 MPa or a minimum tensile strength of up to 570 MPa. One wire electrode can be tested and classified with different shielding gases. This document constitutes a combined specification providing classification utilizing a system based upon the yield strength and the average impact energy of 47 J of all-weld metal, or utilizing a system based upon the tensile strength and the average impact energy of 27 J of all-weld metal. a) Clauses and tables which carry the suffix letter "A" are applicable only to wire electrodes classified to the system based on the yield strength and the average impact energy of 47 J of all-weld metal in accordance with this document. b) Clauses and tables which carry the suffix letter "B" are applicable only to wire electrodes classified to the system based on the tensile strength and the average impact energy of 27 J of all-weld metal in accordance with this document. c) Clauses and tables which have neither the suffix letter "A" nor the suffix letter "B" are applicable to all wire electrodes classified in accordance with this document.