GB/T 3670-2021铜及铜合金焊条标准
英文:Covered electordes for manual metal arc welding of copper and copper alloys GB/T 3670-2021介绍: 国家标准《铜及铜合金焊条》由TC55(全国焊接...
英文:Covered electordes for manual metal arc welding of copper and copper alloys GB/T 3670-2021介绍: 国家标准《铜及铜合金焊条》由TC55(全国焊接...