Simulation and Experimental Studies on Arc Efficiency and Mechanical Characterization for GTA-Welded Ti–6Al–4V Sheets

NiTinol Shape Memory Alloys (SMA) are becoming one of the ideal choices for biomedical industries due to their unique properties such as Shape Memory Effect (SME), Super Elasticity (SE) and Biocompatibility. In the process of making complicated biomedical implants, welding processes play a vital role. In this work, an attempt was made to study the effect of heat input and Post Weld Heat Treatment (PWHT) on the TIG-welded NiTinol SMA. TIG welding was carried out on 1-mm thick NiTinol sheets. With increase in heat input, there was a significant variation in Phase Transformation Temperature (PTT) of welded samples. The variation in PTT is attributed to the formation of intermetallic phases such as Ti2Ni, Ni3Ti and NiTiO3 and coarse grain formation. Electron Back Scattered Diffraction (EBSD) analysis on the weld revealed that the average grain size of parent material was increased from 9.92851[Formula: see text][Formula: see text]m to 48.292345[Formula: see text][Formula: see text]m after the welding process. The PWHT was carried out on the best weld characteristic sample. PWHT did not produce significant effect on PTT. Austenite start and finish temperature slightly decreased after PWHT, whereas slight drift towards the positive side was noticed in martensite start and finish temperature.

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Effect of Different Mig Welding Modes on Hard-Facing of Inconel 718 on 321 Stainless Steel

Karpagaraj¹,

Sarala

Manivannan

et al. 2022

Surf. Rev. Lett.

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In this study, the metal inert gas (MIG) welding process is taken to deposit the Inconel 718 material on 321 stainless steel. Various modes like the DC, DC-pulsed, and DC-wave-pulsed modes in MIG welding are used for depositing Inconel 718. The primary parameters such as the welding current (90–120[Formula: see text]A) and speed (150–350[Formula: see text]mm/min) are varied within the range for making the layer deposition over 321 stainless steel. After performing the layer deposition, the dilution, contact angle, and peak temperature are analyzed to find the optimal MIG welding mode. From the macrograph, very low dilution (7.44%) is identified for the DC mode. The most inferior contact angle ([Formula: see text]) of [Formula: see text] was measured for the DC-wave-pulsed mode. The simulation work predicted a peak temperature of [Formula: see text]C for the DC mode. Considerable microstructure changes have occurred at the weld deposition (dendritic structure) and HAZ (grain coarsening) for all the three modes. At the top, interface, and HAZ locations, the microhardness obtained from the DC-pulsed mode is in between those of the DC and DC-wave-pulsed modes. Overall, the DC-pulsed mode is qualified for making the metal deposition and further work. For 50% overlap, defect-free 2-mm-thick layer depositions are made on the 321 stainless steel surfaces.

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Simulation and Experimental Studies on Arc Efficiency and Mechanical Characterization for GTA-Welded Ti–6Al–4V Sheets

Cited by 3 publications

References 36 publications

Mechanical characterization and simulation of PCGTAW welded thin sheet of SDSS material

Mechanical characterization and simulation of PCGTAW welded thin sheet of SDSS material

EFFECT OF HEAT INPUT AND POST WELD HEAT TREATMENT ON THE PHASE TRANSFORMATION TEMPERATURE OF TIG-WELDED NiTinol SHEETS

Effect of Different Mig Welding Modes on Hard-Facing of Inconel 718 on 321 Stainless Steel

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