We report on a feedback mechanism for rapid identification of optimal laser parameters during welding of AlMg5 coupons using real-time monitoring by high-speed imaging. The purpose was to constrain the liquid movement in the groove in order to obtain pore-free welds in this otherwise difficult-to-weld alloy. High-speed imaging of the welding process via an optical microscope allowed for
(PDF) Laser-arc hybrid welding of thick HSLA steelLaser-arc hybrid welding of thick HSLA steel Ivan Bunaziv 1 , Odd M. Akselsen 1,2 , Jan Frostevarg 3 , Alexander F. H. Kaplan 3 1 Norwegian Unive rsity of Science and Technology, Dep artment of
Laser beam wobble technology has potential to improve narrow-gap laser wire filling welding adaptability for thick plate by its specific weld morphologies and process characteristics. Relevant studies, especially weld formation and microstructural evolution of 316L welded joint under various beam wobble conditions were rare.
Deep penetration fiber laser-arc hybrid welding of thick Jun 01, 2018 · The present investigation addresses laser-arc hybrid welding of 45 mm thick steel with variation in a wide range of process parameters. High volume fraction of acicular ferrite formed in the upper part of the weld metal regardless process parameters.
Effect of Laser Welding on Formability of DP980 steelitself, showing a very high hardness in the weld metal and high-temperature inner HAZ, as could be expected from its chemistry. This region is fully austenized during the laser welding process. A high cooling rate generated in the laser welding process, in com-bination with high carbon equivalent for the DP980 steel evalu-ated with Yurioka
Abstract. This paper focused on the welding 1.8 mm thick 6061 aluminum alloy plates in T-joint form using dual lasers that introduced by a Nd:YAG laser and a CO 2 laser with 4043 aluminum filler wire. The effects of welding parameters on the T-joint weld appearance, microstructure and the joint mechanical properties were studied systematically, The influence of welding parameters included the
Laser Beam Welding of 10 mm Thick T-joints Made of The article presents research on the laser beam welding of 10 mm thick T-joints made of thermomechanically worked high-strength steel S700MC without using a filler metal. The research-related tests involved making single-sided and double-sided welded joints
Laser Beam Welding of Austenitic Stainless Steels 304L steel butt weld made using laser power of 4 kW. The weld bead showed a characteristic of laser welding with dept / width ratio close to 3. No welding cracks or porosity were found in any of the welds, this may be partly due to the good crack resistance of the base metal and the welding
Laser Beam Welding ium Ti-6AI-4V Alloy ASTM Grade Ti Alloys ASTM B265-58T Grades B265-58T Grades 5&2 Weld Microhardness Weld Microstructures Weld Oxygen Content Charpy V-Notch Test materials and in thin sections. However, higher-power lasers, which have deeper penetration capabilities, have opened the way for the use of lasers to weld thicker
Laser and Laser/Arc Hybrid Welding for Land Pipeline use - Currently, when welding steel pipe sections, about six arc welding passes are needed to complete a joint in 10-15 mm thick pipe. However, laser welding can replace several arc weld passes with one single pass as a consequence of its high power density which results in a deep and narrow profile.
Laser-arc hybrid welding of 12- and 15-mm thick structural Mar 25, 2020 · High-power lasers are very effective in welding of plates thicker than 10 mm due to the keyhole mode. High-power intensity generates a vapor-filled cavity which provides substantial penetration depth. Due to the narrow and deep weld geometry, there is susceptibility to high hardness and weld defects. Imperfections occur due to keyhole instability. A 16-kW disk laser was used for
Introduction. Laser beam welding has become one of the important welding techniques used in modern industries because of its superior properties such as high welding speed, low thermal distortion, ease of automation, thin and small weld seams and the possibility of online control of quality during the process , .Nd:YAG and CO 2 lasers are being widely used in the industries such as ship
Reduced pressure laser welding of thick section structural May 01, 2015 · Laser beam welding of 40 mm SM400A steel welded with a high-power disk laser at speed of 1 m/min and with 16 kW laser power at 0.1 kPa pressure conditions shows that:a. Focal point position of 20 mm (work piece middle) is considered to be the optimal one for the welding speed of 1
Single pass laser cold-wire welding of thick section Jun 21, 2018 · The effect of laser welding parameters such as welding speed, continuous-wave (CW) and pulse-wave (PW) modes on weld integrity, microstructure, hardness, and tensile properties was evaluated. Porosity, underfill, and excessive penetration were observed as the main imperfections in the fusion zone (FZ).
This article presents the results of steel-sheet lap-joint-welding using laser beam radiation. The use of a laser beam and keyhole effect for deep material penetration in lap joint welding was presented. Thermodynamic mechanism of laser welding is related to material properties and process parameters. Estimation of welding parameters and joint properties’ analysis was performed through
Study on Pulsed Nd:YAG Laser Butt Welding of High The maximum hardness resulted in the 630 stainless steel region and the minimum hardness occurred for the 321 stainless steel region. This was inferred from the micro hardness test.  Pulsed Nd:YAG laser welding of AISI 304 to AISI 420 stainless steels Pulse Duration (s):0.2 Scan speed:300 mm/min stainless steel Thickness =0.8mm Avg Power (W)=100
Technology qualification of laser(-hybrid) welding of Hybrid laser-arc welding is a process in which the laser beam and the arc are combined in one process zone Sokolov, M., et al., Laser welding and weld hardness analysis of thick section S355 structural steel. Materials & Design, 2011. 32(10):p. 5127-5131.