{"id":421,"date":"2022-04-19T05:53:00","date_gmt":"2022-04-19T05:53:00","guid":{"rendered":"https:\/\/mewelding.com\/?p=421"},"modified":"2022-04-21T02:30:46","modified_gmt":"2022-04-21T02:30:46","slug":"expansion-and-contraction-in-welding-operations","status":"publish","type":"post","link":"https:\/\/mewelding.com\/expansion-and-contraction-in-welding-operations\/","title":{"rendered":"Expansion And Contraction In Welding Operations"},"content":{"rendered":"\n
This article discusses in brief about expansion and shrinkage in welding, its effects, and remedies.<\/p>\n\n\n\n
Welding invariably involves heat. We know that metal expands when heated, and contracts when cooled. When molten metal is added to the joint, some of the sidewalls also get melted and get fused with the freshly deposited weld metal.<\/p>\n\n\n\n
This molten metal is in an expanded state when it is hot. When it cools down and solidifies, the molten metal shrinks. In shrunk state, the metal wants to occupy a lesser volume. However, by this time it is already fused with the walls of base metal.<\/p>\n\n\n\n
However, shrink it must. So, if no restraints are available, the solidifying metal pulls the base metal and distorts it as shown in the figure below.<\/p>\n\n\n\n