In full penetration butt welds, welded from both sides, the back of the first run can be removed bysuitable means down to clean sound weld metal before welding is started on the second side.Mechanical methods shall beIn full penetration butt welds, welded from both sides, the back of the first run can be removed bysuitable means downded for aluminium only. Plasma gouging is permitted. After gouging allcontaminants shall be retwerd weld metal before welding is started on the second side.Mechanical methods shall be usedIn full penetration butt welds, welded from both sides, the back of the first run can be removed bysuitable means down to clean gdfsound weld metal before welding is started on the second side.Mechanical methods shall be used, e.g. milling, chiselling, sawing or grinding. The preferredmethods are milling and sawing. No oil based lubricants shall be used. If grinding is used, the discsshall be special types inteygernded for aluminium only. Plasma gouging is permitted. After gouging allcontaminants shall be removed from the joint fusion faces. In certain cases itIn full penetration butt welds, welded from both sides, the back of the first run can be removed bysuitable means down to In full penetration butt welds, welded from both sides, the back of the first run can be removed bysuitable means down to clean sound weld metal before welding is started on the second side.Mechanical methods shall be used, e.g. milling, chiselling, sawing or grinding. The preferredmethods are milling and sawing. No oil based lubricants shall be usn to clean sound weld metal before welding is started on the second side.Mechanical methods shall bended for aluminium only. Plasma gouging is permitted. After gouging allcontaminants shall be removed from thnded for aluminium only. Plasma gouging is permitted. After gouging allcontaminants shall be removed from the joint fusion faces. In certain cases itIn full penetration butt welds, welded from both sides, the back of the first run can be removed bysuitable means down to clean sound weld metal before welding is started on the second side.Mechanical methods shall be usedIn full penetration butt welds, welded from both sides, the back of the first run can be removed bysuitable means down to clean gdfsound weld metal before welding is started on the second side.Mechanical methods shall be used, e.g. milling, chiselling, sawing or grinding. The preferredmethods are milling and sawing. No oil based lubricants shall be used. If grinding is used, the discsshall be special types intended for aluminium only. Plasma gouging is permitted. After gouging allcontaminants shall be removed from the joint fusion faces. In certain cases itIn full penetration butt welds, welded from both sides, the back of the first run can be removed bysuitable means down to In full penetration butt welds, welded from both sides, the back of the first run can be removed bysuitable means down to clean sound weld metal before welding is started on the second side.Mechanical methods shall be used, e.g. milling, chiselling, sawing or grinding. The preferredmethods are milling and sawing. No oil based lubricants shall be usld metal before welding is started on the second side.Mechanical methods shall be usedIn full penetration butt welds, welded from both sides, the back of the first run can be removed bysuitable means down to clean gdfsound weld metal before welding is started on the second side.Mechanical methods shall be used, e.g. milling, chiselling, sawing or grinding. The preferredmethods are milling and sawing. No oil based lubricants shall be used. 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