Hot-wire Laser Welding of Deep and Wide Gaps

A Study on Cross-Shaped Structure of Invar Material Using Cold Wire Laser Fillet Welding (PART I: Feasibility Study for Weldability)

“…However, a filler material can be added to prevent a welding defect if welding penetration beyond a certain level of depth is required. A type of laser welding called laser welding using a fiber laser is already used for materials such as aluminum and stainless steel, and it is being applied to fillet welding in the form of inserting hot or cold wire materials [17][18][19][20].…”

Multi-Pass Laser and Hybrid Laser-Arc Narrow-Gap Welding of Steel Butt Joints

“…The industrial demand for improving quality of the welds and productivity of the welding process stimulates upgrading of the existing welding technologies and development of the new ones . Gas-metal-arc welding [1,7,8,16,17,19], submerged arc welding [5,9,16,17,19,20], electron beam welding [5,7,16] and electroslag welding [19] received wide acceptance for the fabrication of steel structures from carbon steel plates 10-50 mm thick to manufacture sea ships [1, 6, 7, 14, ], large-size vessels [1, 3, 5-7, 9, 14, 16] and oil and gas pipelines [1,6,7,14,16]. However, besides certain technological advantages [5,16,20], these welding methods also have a number of drawbacks, such as large size of the weld and HAZ [1,7,16,19], susceptibility to hot cracking [1,16,19], necessity for postweld heat treatment (tempering) [7,16,19], presence of high residual thermal strains [1,7,19].…”

“…In this case, using two-and multi-arc welding is recommend [1,7,19,21]. To achieve reliability of multipass narrow-gap arc welding and quality of the resulting welds, it is necessary to make special measures to ensure a stable position of the arc relative to the weld edges [7,8,21]. Various designs of welding heads, guiding contact tubes, torch tips, flat nozzles and process tabs were developed for this purpose [21].…”