标 准 号：GB/T 12469-1990 简体中文标题：焊接质量保证 钢熔化焊接头的要求和缺陷分级 繁体中文标题：焊接质量保证 钢熔化焊接头的要求和缺陷分级 English Name：Quality assurance of welding Requirement for fusion welding joint of steel and clasification for imperfection...