HEAVY SECTION WELDMENTS WITH A GMAW NARROW GAP WELDING PROCESS

1986 ◽  
pp. 65-74
Author(s):  
A.C. Bicknell ◽  
B.M. Patchett
Keyword(s):  
Welding Process ◽  
Narrow Gap ◽  
Narrow Gap Welding ◽  
Heavy Section

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.

Application of Numerical Simulation Considering the Effect of Phase Transformation to the Estimation of Hardness Distribution in Welds

2006 ◽  
Vol 512 ◽  
pp. 379-382 ◽  
Author(s):  
Yoshiki Mikami ◽  
Masahito Mochizuki ◽  
Terumi Nakamura ◽  
Kazuo Hiraoka ◽  
Masao Toyoda
Keyword(s):  
Numerical Simulation ◽  
Phase Transformation ◽  
Thermal Cycle ◽  
Welding Process ◽  
Hardness Distribution ◽  
Narrow Gap ◽  
Thermal Cycles ◽  
Narrow Gap Welding ◽  
Ultrafine Grained ◽  
Good Agreement

This study investigated a method for estimating hardness distribution in welds, considering the effect of phase transformation and weld thermal cycles. Hardness distribution in welds was estimated from fractions and hardness of each microstructure by using rule of mixture. Finite element heat conduction analysis was performed to calculate weld thermal cycles. Microstructures formed corresponding to the thermal cycle were also calculated based on the continuous cooling transformation (CCT) diagram. The method mentioned above was applied to welds of Ultra-Narrow Gap welding process, which was developed for welding of ultrafine-grained steels. The calculated thermal cycles in the welds corresponded with measured results. Moreover, the estimated hardness distribution in the welds, which were estimated by using calculated thermal cycles and the phase fraction of each microstructure, was also in good agreement with measured values.

Modeling of weld formation in variable groove narrow gap welding by rotating GMAW

2020 ◽  
Vol 57 ◽  
pp. 163-173
Author(s):  
Wenhang Li ◽  
Chengfu He ◽  
Jinshan Chang ◽  
Jiayou Wang ◽  
Jing Wu
Keyword(s):  
Narrow Gap ◽  
Narrow Gap Welding ◽  
Weld Formation

Effects of Wire Rotating Frequency on Metal Transfer Process in Rotating Arc Narrow Gap Horizontal GMAW

2011 ◽  
Vol 189-193 ◽  
pp. 3395-3399 ◽  
Author(s):  
Ning Guo ◽  
Yan Fei Han ◽  
Chuan Bao Jia ◽  
Yong Peng Du
Keyword(s):  
Transfer Process ◽  
High Speed ◽  
Stable Process ◽  
Welding Process ◽  
Metal Transfer ◽  
Welding Parameters ◽  
High Speed Photography ◽  
Narrow Gap ◽  
Weld Formation ◽  
Rotating Arc

The metal transfer process with different welding parameters in rotating arc narrow gap horizontal welding is successfully observed by the high-speed photography system. The effects of wire rotating frequency on metal transfer process in rotating arc narrow gap horizontal welding are novelly explored. The metal transfer with different wire rotating frequency presents different modes. The results indicate that the droplet transfer has stable process with the rotating frequency of 5-20 Hz. And the weld formation is quite shapely. But with the high rotating frequency of 50 Hz, the metal transfer process is not acceptable and the weld formation is very pool. Metal transfer process is one of the most important factors of effecting the weld formation in rotating arc horizontal welding process besides the molten pool behavior and welding thermal circles.

Analysis of welding distortion due to narrow-gap welding of upper port plug

2010 ◽  
Vol 85 (5) ◽  
pp. 780-788 ◽  
Author(s):  
Pankaj Biswas ◽  
N.R. Mandal ◽  
Parameswaran Vasu ◽  
Shrishail B. Padasalag
Keyword(s):  
Welding Distortion ◽  
Narrow Gap ◽  
Narrow Gap Welding
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