Narrow Gap Welding Process using Ultra-Low Spatter CO2 Gas Shielded Arc Welding

2016 ◽  
Vol 85 (2) ◽  
pp. 194-196
Author(s):  
Hiroyuki SUMI
Keyword(s):  
Arc Welding ◽  
Welding Process ◽  
Gas Shielded Arc Welding ◽  
Narrow Gap ◽  
Narrow Gap Welding

Design on Cleaning Device for Slag of Narrow Gap Submerged Arc Welding

2013 ◽  
Vol 470 ◽  
pp. 404-407
Author(s):  
Wen Ming Zhang ◽  
Xiao Xu Li ◽  
Bin Wang
Keyword(s):  
Arc Welding ◽  
Welding Process ◽  
Submerged Arc Welding ◽  
Narrow Gap ◽  
Time Saving ◽  
Slag Removal ◽  
High Efficient ◽  
Cleaning Device ◽  
Welding Slag ◽  
Submerged Arc

At present, the Narrow Gap Submerged Arc Welding is an advanced welding technology. As the weld is very deep and narrow, the slag is difficult to clean and will have impact on the quality of welding seam. Therefore, a new kind of narrow gap submerged arc welding slag cleaning device is designed to clean the welding slag. It is consisted of welding walking tractor, height adjuster, slag masher, slag cleaner and slag collector. The narrow gap submerged arc welding slag removal device used for the welding process can realize the cleaning that manpower cannot finish. It is a kind of time-saving, energy-saving and high efficient welding cleaning method.

Effect on Hardness and Microstructures of Rail Joint with Ultra-Narrow Gap Arc Welding by Post Weld Heat Treatment

2017 ◽  
Vol 737 ◽  
pp. 90-94 ◽  
Author(s):  
Lian Gong ◽  
Liang Zhu ◽  
Hong Xiang Zhou
Keyword(s):  
Heat Treatment ◽  
Arc Welding ◽  
Weld Seam ◽  
Stress Relief ◽  
Post Weld Heat Treatment ◽  
Test Results ◽  
Narrow Gap ◽  
Narrow Gap Welding ◽  
Scanning Electron ◽  
Weld Heat

U71Mn rails were welded by ultra-narrow gap welding with constrained arc by flux strips，then normalizing treatment and stress relief annealing were performed for the joints. Another sample with no heat treatment, was studied in comparison. The effect of post weld heat treatment on the hardness and microstructure of rail joint were studied by scanning electron microscope (SEM) and microhardness test. The test results showed that normalizing treatment can improve the hardness of weld seam and base metal, and stress relief annealing couldn’t improve the hardness of joints obviously.

The Welding Deformations of Stainless Steel Pipes With Thick Wall by Narrow Gap Gas Tungsten Arc Welding

2010 ◽  
Author(s):  
Jainxun Zhang ◽  
Chuan Liu ◽  
Jing Niu
Keyword(s):  
Stainless Steel ◽  
Arc Welding ◽  
Welding Process ◽  
Gas Tungsten Arc Welding ◽  
Thick Wall ◽  
Fe Model ◽  
Narrow Gap ◽  
Steel Pipes ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

The austenitic stainless steel pipes with thick wall are widely used in the nuclear power station and are welded by narrow gap gas tungsten arc welding process. The welding deformations of multi-pass butt-welded pipes with 65 and 70mm thickness are investigated experimentally and numerically in the paper. The transient axial deformation and axis shift deformation are measured during welding. An axisymmetric FE model and a thermal mechanical calculating procedure are presented to simulate the welding axial deformations. An effective calculating method by only considering the contraction of each welding pass in the model is proposed. The experimental results show that the axis shift deformation is very small and demonstrates an elastic movement during welding; the axial shrinkage of welded pipes is the mainly deformation, which is very significant during the first several weld pass, and decreases sharply after the weld groove has been filled at the height of 30% wall thickness that makes the stiffness of pipes large enough to resist the welding shrinkage.

scholarly journals Extension of the process limits in laser beam welding of thick-walled components using the Laser Multi-Pass Narrow-Gap welding (Laser-MPNG) on the example of the nickel-based material Alloy 617 occ

2021 ◽  
Author(s):  
Benjamin Kessler ◽  
Dirk Dittrich ◽  
Berndt Brenner ◽  
Jens Standfuss ◽  
Christoph Leyens
Keyword(s):  
Laser Beam ◽  
Low Cycle Fatigue ◽  
Laser Beam Welding ◽  
Welding Process ◽  
Industrial Applications ◽  
Fatigue Tests ◽  
Narrow Gap ◽  
Narrow Gap Welding ◽  
Alloy 617 ◽  
First Time

AbstractThe joining of thick-walled components using beam-based joining techniques is content of worldwide research and development activities, but has not yet been established in industry. State of the art to weld nickel super alloys is currently a TIG narrow-gap welding. The present paper is focusing on a new specific laser beam welding process, the so-called Laser Multi-Pass Narrow-Gap welding (Laser-MPNG). It first explains the process principle based on 2D beam oscillation, the use of fiber lasers and the multi-pass principle. The potential of the Laser-MPNG welding process is demonstrated using the technically significant nickel-based material Alloy 617 occ. As a result, it was possible for the first time to realize a weld with a wall thickness of 140 mm free of cracks or bonding defects. Promising results of creep and low-cycle fatigue tests are used to show the potential that Laser-MPNG welded joints would have for future industrial applications.

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