Arc Stability of Pulse Current Gas Metal Arc Welding of Low Alloy Steel under Different Pulse Parameters and Shielding Gas Compositions

2011 ◽  
Vol 44 (2) ◽  
pp. 29 ◽  
Author(s):  
P. K. Ghosh ◽  
K. Devakumaran ◽  
M. Piyush
Keyword(s):  
Alloy Steel ◽  
Arc Welding ◽  
Pulse Current ◽  
Gas Metal Arc Welding ◽  
Low Alloy Steel ◽  
Shielding Gas ◽  
Pulse Parameters ◽  
Arc Stability ◽  
Metal Arc Welding

High Deposition Pulse Current GMAW Can Change Current Scenario of Thick Wall Pipe Welding

2009 ◽  
Author(s):  
P. K. Ghosh ◽  
Shrirang G. Kulkarni ◽  
Banshi Prasad Agarwal
Keyword(s):  
Arc Welding ◽  
Pulse Current ◽  
Gas Metal Arc Welding ◽  
Thick Wall ◽  
Narrow Gap ◽  
Shielded Metal Arc Welding ◽  
Narrow Gap Welding ◽  
Pulse Parameters ◽  
Metal Arc Welding ◽  
Pipe Welding

The high deposition pulse current gas metal arc welding (P-GMAW) with multiple drop transfer per pulse has been used to weld thick wall austenitic stainless steel pipe. Welding of the pipe was also carried by the commonly used shielded metal arc welding (SMAW) and conventional gas metal arc welding (GMAW) processes and compared. Utility of the P-GMAW to facilitate narrow gap welding of the thick wall pipe by appropriate control of pulse parameters has been discussed in reference to produce superior quality weld. The superiority of weld quality has been justified through the microstructure, mechanical properties, residual stresses and fracture mechanics properties of weld joints. Basic characteristics of the P-GMAW process changing the scenario of thick wall pipe welding have been closely studied with respect to its arc characteristics and behaviour of metal transfer. A precise control of the process in order to achieve desired thermal, mechanical and microstructural effects in the narrow gap welding has been achieved by regulation of summarised influence of pulse parameters, mean current (Im) and arc voltage. The summarised influence of pulse parameters is defined by a hypothetically defined dimensionless factor φ = [(Ib/Ip) f.tb] where, the Ib, Ip, f and tb are the base current, peak current, pulse frequency and pulse off (base) time respectively.

Effect of Shielding Gas Mixture on Gas Metal Arc Welding (GMAW) of Low Carbon Steel (LR Grade A)

2016 ◽  
Vol 705 ◽  
pp. 250-254 ◽  
Author(s):  
Yustiasih Purwaningrum ◽  
Triyono ◽  
M. Wirawan Pu ◽  
Fandi Alfarizi
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Carbon Steel ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Shielding Gas ◽  
Weld Metals ◽  
Metal Arc Welding

The aimed of this research is to determine the feasibility and effect of the mixture of the shielding gas in the physical and mechanical properties. Low carbon steel LR grade A in a thickness 12 mm were joined in butt joint types using GMAW (Gas Metal Arc Welding) with groove’s gap 5 mm and groove angle’s 400 with variation of shielding gas composition. The composition of shielding gas that used were 100% Ar, 100 % CO2 and 50% Ar + 50 % CO2. The measured of mechanical properties with regard to strength, hardness and toughness using, tensile test, bending test, Vickers hardness Test, and Charpy impact test respectively. The physical properties examined with optical microscope. Results show that tensile strength of welding metals are higher than raw materials. Welds metal with mixing Ar + CO shielding gas has the highest tensile strength. Hardness of weld metals with the shielding gas 100% Ar, 100 % CO2 and 50% Ar + 50 % CO2 are 244.9; 209.4; and 209.4 VHN respectively. The temperature of Charpy test was varied to find the transition temperature of the materials. The temperature that used were –60°C, -40°C, -20°C, 0°C, 20°C , and room temperature. Weld metals with various shielding gas have similar trends of toughness flux that was corellated with the microstructure of weld .

scholarly journals Visualisation and optimisation of shielding gas coverage during gas metal arc welding

2018 ◽  
Vol 255 ◽  
pp. 451-462 ◽  
Author(s):  
I. Bitharas ◽  
N.A. McPherson ◽  
W. McGhie ◽  
D. Roy ◽  
A.J. Moore
Keyword(s):  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Shielding Gas ◽  
Metal Arc Welding
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