A Study on Deformation According to Steel Constraints During Thick-Plate Fillet Welding and Line Heating

Abstract

Most of the products manufactured in shipyards are steel structures, and they are mainly manufactured using welding techniques. There are various welding methods, and use of very high heat is common. Thermal deformation occurs due to the high heat of welding when manufacturing steel structures, and leads to errors compared to the design. Methods to ensure dimensional accuracy include optimizing the welding order, applying reverse setting before welding by predicting thermal deformation in advance, and suppressing thermal deformation through constraints. However, the most popular method for this purpose is flame straightening. This study proposes a method of utilizing steel constraints during welding and line heating to control thermal deformation by welding. Analytical verification confirmed the differences according to the presence or absence of steel constraint application and the time of application. Consequently, it was confirmed that line heating is effective in correcting thermal deformation and steel constraints can maximize the effect of line heating.