| Hi, backing: a material placed at the root of a weld joint for the purpose of supporting molten weld metal so as to facilitate complete joint penetration. The material may or may not fuse into the joint.(Ex., Double welded groove,single welded groove with backing,backing may be of metal or ceramic) Without backing: There is no material placed at the root of joint and molten weldmetal itself facilitate complete hoint penetration.(Ex.,Single welded groove-Single V,without any metal or ceramic at the root of a weldjoint) Thanks & Regards, (Karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282 --- On Thu, 12/16/10, SP <mechweld_10@rediffmail.com> wrote:
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