Influence of Keyhole Mode of Plasma Arc Welding on Microstructure and Mechanical Properties of Similar Butt-Welded Incoloy 800H

2019 ◽  
Vol 45 (2) ◽  
pp. 1135-1142
Author(s):  
T. M. Harish ◽  
S. Jerome ◽  
B. Yadukrishna ◽  
Rishi S. Kumar ◽  
C. Midhun Suresh ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Arc Welding ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Incoloy 800H ◽  
Microstructure And Mechanical Properties

scholarly journals EVALUATION AND MECHANICAL PROPERTIES OF PLASMA ARC WELDED IS2062 STEEL TUBE JOINTS

2020 ◽  
Vol 15 (3) ◽  
Author(s):  
Subravel V ◽  
Prabu S
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Weld Metal ◽  
Arc Welding ◽  
Weld Zone ◽  
Welding Current ◽  
Steel Tube ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Different Levels

In th present work, an attempt has been made to study the effect of plasma arc welding on fusion characteristics of IS 2062 joints. Joints were fabricated using different levels of welding current (140 Amp –160 Amp). The formation of the amount of ferrite in the weld metal controls the microstructural evolution during high-temperature service and higher hardness in the fusion zone, which is due to martensitic formation in the weld zone

Interface characteristics and formation mechanism of plasma arc welding-brazing aluminum alloy/ultrahigh-strength steel joint

2021 ◽  
Vol 118 (4) ◽  
pp. 405
Author(s):  
Di Wu ◽  
Wenhua Geng ◽  
Hongmei Li ◽  
Lei Wang ◽  
Ke Yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Formation Mechanism ◽  
Arc Welding ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Interface Zone ◽  
Ultrahigh Strength ◽  
Ultrahigh Strength Steel ◽  
Interface Characteristics

A butt welding-brazing joint of 5A06 aluminum alloy and DP1180 ultrahigh-strength steel was carried out by using plasma arc welding (PAW) with Al-Si welding wire. Interface characteristics, formation mechanism and mechanical properties of the joint were investigated. The results showed that the dissimilar joint contained bond zone, weld zone and Al/steel interface zone. During PAW, the inter-diffusion of Fe and Al and the interfacial reaction occurred, and the double-layer structure intemtallics (IMCs) composed of Fe4Al13 layer and Fe2Al5 layer were produced in the interface zone. The thickness and morphology of both IMC layers depended on different positions in the interface zone. The Fe2Al5 layer thickness decreased obviously and its morphology changed from continuous layer to discontinuous layer with the decrease of welding heat input. The average tensile strength of the joint was 88 MPa and the joint fractured at the Al/steel interface zone with the highest hardness (524 HV). The interface zone IMCs were the main factor of affecting the mechanical properties of aluminum alloy and ultrahigh-strength steel PAW joint.

Microstructure and Mechanical Properties of Plasma Arc Welding Joint for Laser Melting-Deposited AerMet100 Ultrahigh-Strength Steel

2014 ◽  
Vol 789 ◽  
pp. 424-430
Author(s):  
X.Z. Ran ◽  
H. Cheng ◽  
D. Liu ◽  
S.Q. Zhang ◽  
H.B. Tang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Arc Welding ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Laser Melting ◽  
Welding Joint ◽  
Ultrahigh Strength ◽  
Ultrahigh Strength Steel ◽  
Heat Treated

The repair of laser melting-deposited AerMet100 ultrahigh strength steel (UHSS) heat-treated samples with groove machined was conducted by low-cost plasma arc welding (PAW). And the microstructure and mechanical properties of welding joint were examined by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), micro-hardness test and the tensile mechanical test. The experimental results indicated that the welding zone with low hardness values mainly consisted of columnar grains with about 200μm width which epitaxial growth from substrate grains, and in which the cellular morphology character appearing at the bottom in comparison with dendrite with lateral branching appearing at the top. Three zones, i.e., sufficient quenched zone, insufficient quenched zone and high-temperature tempered zone, were divided by heating affected temperature and microstructure characteristic in heat affected zone (HAZ), and there was a lowest hardness value region distributed in high-temperature tempered zone. Compared to that of undamaged heat treated forged one, the tensile mechanical property of the repaired laser melting deposited sample got a few decrease but was still well, in which the tensile strength σb, yield strength σs, elongation δ5 and reduction of area Ψ was 1627Mpa, 1285Mpa, 10.5% and 45% respectively. In addition, the isothermal thermal simulation test surveyed that the tensile fracture position locating in high-temperature tempered zone with the lowest hardness value could ascribe to the growth of alloy carbide and increase of reverted austenite in over-aged temperature.

Powder plasma arc additive manufactured CoCrFeNi(SiC)x high-entropy alloys: Microstructure and mechanical properties

2021 ◽  
Vol 282 ◽  
pp. 128736 ◽  
Author(s):  
Qingkai Shen ◽  
Xiangdong Kong ◽  
Xizhang Chen ◽  
Xukai Yao ◽  
Vladislav B. Deev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Entropy Alloys ◽  
Plasma Arc ◽  
High Entropy ◽  
Microstructure And Mechanical Properties

scholarly journals Numerical Analysis of Keyhole and Weld Pool Behaviors in Ultrasonic-Assisted Plasma Arc Welding Process

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 703
Author(s):  
Junnan Qiao ◽  
Chuansong Wu ◽  
Yongfeng Li
Keyword(s):  
Shear Stress ◽  
Weld Pool ◽  
Arc Welding ◽  
Acoustic Radiation ◽  
Radiation Force ◽  
Acoustic Radiation Force ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Arc Pressure ◽  
Ultrasonic Assisted

The acoustic radiation force driving the plasma jet and the ultrasound reflection at the plasma arc-weld pool interface are considered to modify the formulas of gas shear stress and plasma arc pressure on the anode surface in ultrasonic-assisted plasma arc welding (U-PAW). A transient model taking into account the dynamic changes of heat flux, gas shear stress, and arc pressure on the keyhole wall is developed. The keyhole and weld pool behaviors are numerically simulated to predict the heat transfer and fluid flow in the weld pool and dynamic keyhole evolution process. The model is experimentally validated. The simulation results show that the acoustic radiation force increases the plasma arc velocity, and then increases both the plasma arc pressure and the gas shear stress on the keyhole wall, so that the keyholing capability is enhanced in U-PAW.

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