【精品EHS安全文档】热作业专项培训
安全环保部HOTWORK热作业专项培训WELDINGisaprocessthatjoinsmaterials,usuallymetalsorthermoplastics,bycausingcoalescence.Thisisoftendonebymeltingtheworkpiecesandafillermaterialtoformapoolofmoltenmaterialthatcoolstobecomeastrongjoint,butsometimespressureisusedinconj...