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＜会議発表論文＞
A Study on Laser-Arc Hybrid Welding of Butt Welded joints of Steel Plates for Hulls under the Condition of I-Gap with Zero Initial Gap
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| 概要 | Laser-arc hybrid welding (LAHW) can significantly reduce weld deformation due to the lower heat input compared to conventional arc welding, which is the standard method used in the current hull constr...uction stages. Because of its superior heat concentration, LAHW has a relatively larger plate thicknesses over which I-shaped groove joints can be fabricated than conventional arc welding. One of authors reported that one-pass welding without backing material was possible for a 17 mm thick steel plate with I-shaped groove. However, it was necessary to insert a filler gauge into the groove face and set the gap across the weld line to 0.5 mm. From the viewpoint of introducing LAHW into the construction stage of general merchant ships, this study examined the welding work conditions to fabricate sound welded joints by LAHW under the following conditions: (1) groove fabrication by plasma cutting and (2) I-shaped groove with zero initial gap width. With reference to our previous studies, a search was conducted for welding parameters (laser power, arc current and voltage, etc.) that would allow the joint to be fabricated by a single pass of construction. As a result, although welding conditions with good bead appearance were identified, hot cracking of the weld metal occurred in some of the joints. To prevent hot cracking, the number of welding passes was changed from one to two, the length of the molten pool formed in the first pass was shortened in the thickness direction, and the second pass was performed by arc welding alone to compensate for the insufficient reinforcement height. As a result, it was possible to fabricate welded joints with good bead appearance without hot cracking.続きを見る |
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| 登録日 | 2024.12.12 |
| 更新日 | 2025.02.17 |