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Patent Details

Indian Institute of Technology (IIT) Roorkee 
Single seam multilayer narrow gap pulse current gas metal arc welding 
P.K Ghosh and Banshi Prasad Agarwal  
Indian Institute of Technology (IIT) Roorkee 
Application type:
Applied - 2010-04-29 
Application Number:
Applied at:
Entered by:
Indian Institute of Technology (IIT) Roorkee 
The present invention is related to a narrow GMAW torch nozzle for welding to produce centrally laid single seam per layer multipass extra narrow gap thick steel weld free from lack of groove wall fusion. The present invention comprises of a narrow GMAW torch nozzle having desired cooling efficiency in pulsed current GMAW (PGMAW) process being operated at optimum pulse parameters defined by a factor ᶲ denoting summarized influence of pulse parameters. The welding is employed with the help of suitable procedural measures of welding considering appropriate utilization of geometrical aspects and thermal behavior of weld pool to ensure proper groove wall fusion. The narrow GMA welding torch nozzle access a practically narrowest possible weld groove in thick section for PGMA weld deposition. Superiority of the weld joint has been established with respect to its significant reduction of residual stresses as well as improvement of mechanical and metallurgical properties in comparison to those observed in weld joint prepared by the convectional welding technique.  

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