Abstract
The currently predominant joining process for constructional steel in the sheet thickness range of 40 mm, as is customary in pipeline and bridge construction, is submerged arc welding. Due to the large number of welding layers required, a high quantity of energy, expensive welding filler material, and also distortion are introduced into the component. The laser beam submerged arc hybrid welding combines the conventional submerged arc welding process with a high-energy laser beam welding process to form a hybrid process. With this process, sheets with a thickness of up to 40 mm can be joined in butt joints in just two welding layers. In this paper, the hybrid character of this method is emphasized. First, the geometric shape of the melt pool in the cross section is discussed and later the mixing of both melt pools is verified by energy-dispersive x-ray spectroscopy analyses. In addition, results when joining gaps are present are demonstrated and discussed.
Highlights
IntroductionAND STATE OF THE ARTJoining thick-walled steel structures is a frequently encountered welding task in the field of wind power (foundation and tower structures) or in pipe manufacturing (longitudinal seam and spirally welded pipes). At present, conventional welding processes such as submerged arc welding (SAW) are primarily used to meet this joining task. Normally, a double-V-weld seam preparation is selected for this purpose
AND STATE OF THE ARTJoining thick-walled steel structures is a frequently encountered welding task in the field of wind power1 or in pipe manufacturing.2 At present, conventional welding processes such as submerged arc welding (SAW) are primarily used to meet this joining task.1–3 Normally, a double-V-weld seam preparation is selected for this purpose
The geometrical arrangement of laser and SAW-torch to one another is of great relevance for the welding result and was varied within the scope of the welding results presented in this paper
Summary
AND STATE OF THE ARTJoining thick-walled steel structures is a frequently encountered welding task in the field of wind power (foundation and tower structures) or in pipe manufacturing (longitudinal seam and spirally welded pipes). At present, conventional welding processes such as submerged arc welding (SAW) are primarily used to meet this joining task. Normally, a double-V-weld seam preparation is selected for this purpose. Joining thick-walled steel structures is a frequently encountered welding task in the field of wind power (foundation and tower structures) or in pipe manufacturing (longitudinal seam and spirally welded pipes).. Conventional welding processes such as submerged arc welding (SAW) are primarily used to meet this joining task.. A double-V-weld seam preparation is selected for this purpose. After some tacking passes have been welded using a gas metal arc welding (GMAW) process, numerous welding beads are welded using the SAW process, depending on the sheet thickness, exemplified by Fig. 1. In addition to the normal welding time, thermal component distortion is almost unavoidable, which means that complex straightening work has to be carried out. The high number of welding layers entails the risk of producing intermediate pass errors.
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