Optimising pulsed current TIG welding parameters to refine the fusion zone

2006 ◽  
Vol 11 (1) ◽  
pp. 57-60 ◽  
Author(s):  
V. Ravisankar ◽  
V. Balasubramanian
Keyword(s):  
Fusion Zone ◽  
Tig Welding ◽  
Welding Parameters ◽  
Pulsed Current

Enhanced Mechanical Properties of AA5083 GTA Weldments with Current Pulsing and Addition of Scandium

2013 ◽  
Vol 765 ◽  
pp. 716-720 ◽  
Author(s):  
N. Kishore Babu ◽  
Patil Yogesh Bhikanrao ◽  
K. Sivaprasad
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Fusion Zone ◽  
Weld Zone ◽  
Solidification Structure ◽  
Grain Structure ◽  
Welding Parameters ◽  
Pulsed Current ◽  
Current Technique ◽  
Aa5083 Alloy

AA5083 alloy is welded with gas tungsten arc welding using optimized welding parameters. Al-Si-Sc master alloy filler with varying contents of scandium is used for welding. Welding was carried out with and without AC-pulsed current techniques. A narrow heat affected zone with more refined grain structure is observed in the case of the pulsed current technique. Furthermore, it is observed that the columnar solidification structure in the fusion zone was suppressed and fine equiaxed grains were formed in the weld zone with increasing scandium content, which is attributed to the grain refinement effect of scandium with the generation of increased nucleating sites during weld solidification. This effect is reflected in mechanical properties also. An increased hardness of about 10 % results with pulsed current technique compared to about 20 % with an addition of 0.75 % scandium. However, in the case of tensile properties pulsing resulted in about 8 % increase in tensile strength and addition of 0.75 % scandium resulted in about 40 % increase in tensile strength. Both the pulsed current technique and the addition of scandium were observed to be better in increasing not only strength but also elongation due to the refined grain structure in the weld fusion zone.

Evaluation Study on Angular Distortion and Residual Stress of Stainless Steel Pulsed TIG Weldment

2011 ◽  
Vol 291-294 ◽  
pp. 905-909
Author(s):  
Kuang Hung Tseng ◽  
Hsiang Lin Sung
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Vertical Displacement ◽  
Evaluation Study ◽  
Tig Welding ◽  
Angular Distortion ◽  
Hole Drilling ◽  
Welding Parameters ◽  
Pulsed Current ◽  
Lower Heat

The aim of this study was to investigate the effect of pulsed current welding parameters on angular distortion and residual stress of TIG weldment. Autogenous TIG welding was applied on type 316L stainless steel sheet to produce bead-on-plate welds. Angular distortion was determined using the mean vertical displacement method. Residual stress was determined using the hole-drilling strain- gage method. The results showed that the pulsed current TIG welding has a number of advantages, including lower heat input and consequently a reduction in distortion and residual stress of weldment.

Prediction of Weld Strength of PC-TIG Welded Al-8% SiC Metal Matrix Composite – An Empirical Model (EM) Approach

2015 ◽  
Vol 813-814 ◽  
pp. 467-473
Author(s):  
Sivachidambaram Pichumani ◽  
Krishnamoorthy Balachandar
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Empirical Model ◽  
Metal Matrix ◽  
Tig Welding ◽  
Weld Strength ◽  
Welding Parameters ◽  
Pulsed Current ◽  
Bend Strength

This work is focused on the development of empirical model to predict the mechanical properties of welded Al-SiC metal matrix composites. Autogenous pulsed current-Tungsten inert gas (PC-TIG) welding was performed on 5mm thick Al-8%SiC composite plates. Regression equations were developed to predict the tensile strength, yield strength, percentage of elongation and bend strength of pulsed current TIG weld Al-SiC composite by varying weld parameters such as peak current, base current, pulse on time and pulse frequency. The effect of each pulsed current TIG welding parameters and interaction between two more parameters on the ultimate tensile strength, yield strength, percentage of elongation and bend strength were studied for clear understanding of PCTIG welding parameters. Improved mechanical properties viz. 136 MPa tensile strength, 117 MPa yield strength with 15% elongation were achieved using optimal PCTIG welding parameters. The predicted values were experimentally verified for consistency and validation. This study also resulted in understanding the significant factors which were responsible for improved weld strength of the chosen candidate material.

INVESTIGATION OF PULSE FREQUENCY ON FUSION ZONE CHARACTERISTICS OF GTA WELDED AZ31B MAGNESIUM ALLOY JOINTS

2020 ◽  
Vol 15 (2) ◽  
Author(s):  
Subravel V
Keyword(s):  
Magnesium Alloy ◽  
Tensile Properties ◽  
Fusion Zone ◽  
Welding Speed ◽  
Pulse Frequency ◽  
Pulsed Current ◽  
Az31b Magnesium Alloy ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Different Levels

In this investigation an attempt has been made to study the effect of welding on fusion characteristics of pulsed current gas tungsten arc welded AZ31B magnesium alloy joints. Five joints were fabricated using different levels of welding speed (105 mm/min –145 mm/min). From this investigation, it is found that the joints fabricated using a welding speed of 135 mm/min yielded superior tensile properties compared to other joints. The formation of finer grains and higher hardness in fusion zone and uniformly distributed precipitates are the main reasons for the higher tensile properties of these joints

Optimizing Pulsed Current Micro Plasma Arc Welding Parameters to Maximize Ultimate Tensile Strength of AISI 304L Sheets Using Response Surface Method

2014 ◽  
Vol 660 ◽  
pp. 322-326
Author(s):  
Kondapalli Siva Prasad ◽  
Chalamalasetti Srinivasa Rao ◽  
Damera Nageswara Rao
Keyword(s):  
Mathematical Model ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Response Surface ◽  
Response Surface Method ◽  
Welding Parameters ◽  
Pulsed Current ◽  
Plasma Arc ◽  
Aisi 304L ◽  
Surface Method

AISI 304L is an austenitic Chromium-Nickel stainless steel offering the optimum combination of corrosion resistance, strength and ductility. These attributes make it a favorite for many mechanical components. The paper focuses on developing mathematical model to predict ultimate tensile strength of pulsed current micro plasma arc welded AISI 304L joints. Four factors, five level, central composite rotatable design matrix is used to optimize the number of experiments. The mathematical model has been developed by response surface method. The adequacy of the model is checked by ANOVA technique. By using the developed mathematical model, ultimate tensile strength of the joints can be predicted with 99% confidence level. Contour plots are drawn to study the interaction effect of pulsed current micro plasma arc welding parameters ultimate tensile strength of AISI 304L steel. The developed mathematical model has been optimized using Response Surface Method to maximize the ultimate tensile strength.

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