scholarly journals Effect of Weld Heat Input Modeling and the Material Hardening Model for Gas Tungsten Arc Welding Finite Element Analysi

2021 ◽  
Author(s):  
Chang-Young Oh ◽  
Yongjoon Kang ◽  
Seung-Gun Lee ◽  
Jun-Young Jeon ◽  
Sung-Sik Kang
Keyword(s):  
Finite Element ◽  
Heat Input ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Hardening Model ◽  
Gas Tungsten Arc ◽  
Input Modeling ◽  
Gas Tungsten ◽  
Weld Heat

Development of New Weld Heat Input and Dilution Equations for Gas Tungsten Arc Welding: Part 1

2013 ◽  
Author(s):  
Jonathan K. Tatman ◽  
Steven L. McCracken ◽  
Trevor G. Hicks
Keyword(s):  
Heat Input ◽  
Arc Welding ◽  
Filler Metal ◽  
Welding Process ◽  
Gas Tungsten Arc Welding ◽  
Power Ratio ◽  
Gas Tungsten Arc ◽  
Welding Part ◽  
Gtaw Process ◽  
Gas Tungsten

Predicting weld dilution for machine gas tungsten arc welding (GTAW) is a challenge due to the number of variables associated with the welding process. Proper heat input and power ratio controls are critical in many welding applications to control weld dilution, such as for dissimilar metal welds where low weld dilution is necessary to prevent solidification cracking or for cladding where weld dilution is minimized to maintain corrosion resistance of the clad material. This paper discusses the preliminary development and validation of improved weld dilution, heat input, and power ratio equations for the GTAW process. The new equations incorporate power added for the hot wire GTAW process, filler metal material properties, and the heat used to melt the filler metal when added to the GTAW process. The weld dilution equation was validated by comparing calculated dilution values to measured values from bead-on-plate weld trials performed on a variety of filler metals and substrates. Results of the testing and validation along with limitations of the new equations are discussed.

scholarly journals Effect of Heat Input on Distortions and Residual Stresses Induced by Gas Tungsten Arc Welding in SS 316L to INCONEL625 Multipass Dissimilar Welded Joints

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Harinadh Vemanaboina ◽  
B Sridhar Babu ◽  
Edison Gundabattini ◽  
Paolo Ferro ◽  
Kaushik Kumar
Keyword(s):  
Residual Stresses ◽  
Heat Input ◽  
Arc Welding ◽  
Elevated Temperatures ◽  
Welded Joint ◽  
Gas Tungsten Arc Welding ◽  
Average Value ◽  
Gas Tungsten Arc ◽  
Gtaw Process ◽  
Gas Tungsten

In the present study, distortion and residual stresses in the multipass welded joint were analyzed with respect to heat input. The welded joint was produced using the gas tungsten arc welding (GTAW) process with dissimilar Ni-based filler of ERNiCrMo-3. This dissimilar joint is essential in power generating nuclear and thermal plants operating at elevated temperatures. The distortion and residual stress measurements were taken using the Vernier height gauge and XRD method. To evaluate the mechanical properties, tensile testing was carried out at room temperature. The welded joint qualified the tensile test with an average value of 593 MPa. In the weld metal, a significant variation of residual stresses is measured on the top surface of the weldment along with the thickness with peak magnitude of 145 MPa to 180 MPa at the fusion zone.

Weldability Characteristics of Sintered Hot-Forged AISI 4135 Steel Produced through P/M Route by Using Pulsed Current Gas Tungsten Arc Welding

2016 ◽  
Vol 35 (1) ◽  
pp. 9-19 ◽  
Author(s):  
Joby Joseph ◽  
S. Muthukumaran ◽  
K.S. Pandey
Keyword(s):  
Fusion Zone ◽  
Heat Input ◽  
Arc Welding ◽  
Testing Machine ◽  
Gas Tungsten Arc Welding ◽  
Filler Materials ◽  
Pulsed Current ◽  
Rectangular Plates ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

AbstractPresent investigation is an attempt to study the weldability characteristics of sintered hot-forged plates of AISI 4135 steel produced through powder metallurgy (P/M) route using matching filler materials of ER80S B2. Compacts of homogeneously blended elemental powders corresponding to the above steel were prepared on a universal testing machine (UTM) by taking pre-weighed powder blend with a suitable die, punch and bottom insert assembly. Indigenously developed ceramic coating was applied on the entire surface of the compacts in order to protect them from oxidation during sintering. Sintered preforms were hot forged to flat, approximately rectangular plates, welded by pulsed current gas tungsten arc welding (PCGTAW) processes with aforementioned filler materials. Microstructural, tensile and hardness evaluations revealed that PCGTAW process with low heat input could produce weldments of good quality with almost nil defects. It was established that PCGTAW joints possess improved tensile properties compared to the base metal and it was mainly attributed to lower heat input, resulting in finer fusion zone grains and higher fusion zone hardness. Thus, the present investigation opens a new and demanding field in research.

scholarly journals Arc Characteristics and Weld Bead Microstructure of Ti-6Al-4V Titanium Alloy in Ultra-high Frequency Pulse Gas Tungsten Arc Welding (UHFP-GTAW) Process

2020 ◽  
Vol 26 (4) ◽  
pp. 426-431
Author(s):  
Wei LI ◽  
Gaochong LV ◽  
Qiang WANG ◽  
Songtao HUANG
Keyword(s):  
Titanium Alloy ◽  
Fusion Zone ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Weld Bead ◽  
Gas Tungsten Arc ◽  
Arc Characteristics ◽  
Arc Pressure ◽  
Gtaw Process ◽  
Gas Tungsten

To resolve the problem of grain coarsening occurring in the fusion zone and the heat-affected zone during conventional gas tungsten arc welding(C-GTAW) welded titanium alloy, which severely restricts the improvement of weld mechanical properties, welding experiments on Ti-6Al-4V titanium alloy by adopting ultra-high frequency pulse gas tungsten arc welding (UHFP-GTAW) technique were carried out to study arc characteristics and weld bead microstructure. Combined with image processing technique, arc shapes during welding process were observed by high-speed camera. Meanwhile the average arc pressure under various welding parameters were obtained by adopting pressure measuring equipment with high-precision. In addition, the metallographic samples of the weld cross section were prepared for observing weld bead geometry and microstructure of the fusion zone. The experimental results show that, compared with C-GTAW, UHFP-GTAW process provides larger arc energy density and higher proportion of arc core region to the whole arc area. Moreover, UHFP-GTAW process has the obviously effect on grain refinement, which can decrease the grain size of the fusion zone. The results also revealed that a significant increase of arc pressure while increasing pulse frequency of UHFP-GTAW, which could improve the depth-to-width ratio of weld beads.

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