{"id":550,"date":"2022-04-18T08:52:00","date_gmt":"2022-04-18T08:52:00","guid":{"rendered":"https:\/\/mewelding.com\/?p=550"},"modified":"2022-04-19T01:29:26","modified_gmt":"2022-04-19T01:29:26","slug":"multilayer-welding","status":"publish","type":"post","link":"https:\/\/mewelding.com\/multilayer-welding\/","title":{"rendered":"Multilayer Welding"},"content":{"rendered":"\n
Multilayer welding, as the name suggests, is the name given to welds which are made by using multiple<\/em> layers of weld. Using multiple layers becomes necessary when welding of thick sections is being done.<\/p>\n\n\n\n High thickness base metals cannot be welded with a single pass, as the resulting bead would be too big, unwieldy, and ugly. Such a weld would not have necessary ductility or strength. Further, chances of burn though are high due to use of very high input.<\/p>\n\n\n\n In such cases, multilayer welding or multipass welding must be resorted to. In this, multiple layers are deposited one over another using a standard size electrode, till the entire thickness gets filled. A smaller (than in single pass welding) diameter is used for depositing multiple layers. Due to the smaller size electrode, the size of the weld puddle is small.<\/p>\n\n\n\n A smaller puddle does not pose danger of burn through. This also allows welder to achieve \u00a0complete joint penetration<\/a>\u00a0without inviting excessive penetration while laying root passes. A smaller puddle results in a smaller heat affected zone. The puddle can be easily controlled by the welder. <\/p>\n\n\n\n A skilful welder can produce a weld without metal oxides, slag inclusion, and\u00a0incomplete fusion<\/a> with the side walls. Some examples of multilayer welding in different types of welds are shown in the figure below.<\/p>\n\n\n\n