Characteristics of Miab welding process and joints

2011 ◽  
Vol 55 (1-2) ◽  
pp. 25-31
Author(s):  
Danut Iordachescu ◽  
Bogdan Georgescu ◽  
Mihaela Iordachescu ◽  
Raul Lopez ◽  
Rosa Maria Miranda ◽  
...  
Keyword(s):  
Welding Process ◽  
Miab Welding

Effect of Upset Current in Magnetically Impelled Arc Butt (MIAB) Welding of Carbon Steel Tubes

2014 ◽  
Vol 592-594 ◽  
pp. 240-244 ◽  
Author(s):  
R. Sivasankari ◽  
V. Balusamy ◽  
G. Buvanashekaran
Keyword(s):  
Carbon Steel ◽  
Short Pulse ◽  
Welding Process ◽  
Microstructural Characterization ◽  
Weld Interface ◽  
Steel Tubes ◽  
Weld Properties ◽  
Miab Welding ◽  
Outside Diameter

Magnetically Impelled Arc Butt (MIAB) welding is an unique forge welding process in which an arc is drawn in the gap between the two tubes to be welded in order to raise them to a high temperature to allow forging to form a solid state weld. This paper presents the investigations carried out on MIAB welding trials of carbon steel tubes with varying upset current. Upset current is the short pulse of high current applied prior to upset. It plays a significant role in expulsion of molten metal and impurity from weld interface. This study aims at studying the effect of upset current on weld properties. Carbon steel tubes of SA-210 Grade A have been chosen with outside diameter of 44 mm and thickness of 4.5 mm. Mechanical and microstructural characterization of MIAB weldments was carried out. Good correlation exists between the mechanical properties/microstructure and upset current. Lower upset current has detrimental effect on weld tensile strength due to incomplete expulsion of decarburized zone.

Magnetic flux distribution modelling of magnetically-impelled arc butt-welding of steel tubes using finite-element analysis

2008 ◽  
Vol 222 (9) ◽  
pp. 1783-1790 ◽  
Author(s):  
S Arungalai Vendan ◽  
S Manoharan ◽  
G Buvanashekaran ◽  
C Nagamani
Keyword(s):  
Finite Element ◽  
Magnetic Flux ◽  
Flux Density ◽  
Welding Process ◽  
Magnetic Flux Density ◽  
Steel Tubes ◽  
Element Analysis ◽  
Butt Welding ◽  
Miab Welding ◽  
Flux Density Distribution

Magnetically-impelled arc butt-welding (MIAB) is a pressure-welding process. In this process, heat is generated prior to forging by an arc created between two clamped and aligned tubes. This arc rapidly rotates along the peripheral edges of the tubes to be welded due to the electromagnetic force resulting from the interaction of the arc current and the magnetic field in the gap. To be precise, the magnetic flux density is the significant parameter that governs the arc rotation and the weld quality. This paper presents a three-dimensional finite-element model to determine the magnetic flux density distribution in the MIAB welding process. The objective of this study is to perform a non-linear electromagnetic analysis using the finite-element package ANSYS, and to explore the interdependence of MIAB welding parameters such as gap size, exciting current in the coil, and coil position from the weld centre, which influence the electromagnetic force generated in the welding process and weld quality. The results of this analysis are verified with the available experimental data for steel tubes (outer diameter 50 mm and thickness 2 mm). The results obtained using finite-element analysis establish that the magnetic flux density distribution in the gap increases with increasing exciting current and decreasing gap size and coil position from the weld centre.

scholarly journals Study on notch tensile properties of Magnetically Impelled Arc Butt (MIAB) welded carbon steel tubes

2021 ◽  
Vol 2070 (1) ◽  
pp. 012194
Author(s):  
R Sivasankari ◽  
V Balusamy ◽  
G Buvanashekaran
Keyword(s):  
Tensile Strength ◽  
Carbon Steel ◽  
Short Pulse ◽  
Welding Process ◽  
Weld Interface ◽  
Strength Ratio ◽  
Uniform Heating ◽  
Notch Tensile Strength ◽  
Miab Welding ◽  
Notch Strength

Abstract Magnetically Impelled Arc Butt (MIAB) welding is a pressure welding process that uses the circumferential rotating arc to cause uniform heating of the faying surfaces. In this work, notched tensile testing of MIAB welded Carbon steel was carried out to determine the notch sensitivity of Thermo-Mechanically Affected Zones (TMAZ) and to compare the notch tensile property of these zones with the base metal property. In MIAB welding, after sufficient melting of the faying surface, a short pulse of high current is applied to expel the molten metal and impurities from the interface before welding. Insufficient expulsion and formation of Light Band (LB) zone at weld interface resulted in lower Notch Tensile Strength (NTS). Incomplete expulsion with lower upset current at the weld interface contributes to lower Normalized Notch Strength Ratio. Instead higher upset current contributed to higher NTS due to complete expulsion and stronger acicular ferrite formation. Other TMAZs away from the weld interface showed higher notch tensile strength with Notch Strength Ratio (NSR) and Normalized Notch Tensile Strength Ratio (NTSN) greater than unity.

Effects of bottom plate in friction stir welding of AA6061-T6

2020 ◽  
Vol 118 (1) ◽  
pp. 108
Author(s):  
M.A. Vinayagamoorthi ◽  
M. Prince ◽  
S. Balasubramanian
Keyword(s):  
Mechanical Properties ◽  
Axial Load ◽  
Weld Zone ◽  
Welding Process ◽  
Bottom Plate ◽  
Welding Parameters ◽  
Nugget Zone ◽  
Friction Stir ◽  
Weld Joints ◽  
Fine Grain

The effects of 40 mm width bottom plates on the microstructural modifications and the mechanical properties of a 6 mm thick FSW AA6061-T6 joint have been investigated. The bottom plates are placed partially at the weld zone to absorb and dissipate heat during the welding process. An axial load of 5 to 7 kN, a rotational speed of 500 rpm, and a welding speed of 50 mm/min are employed as welding parameters. The size of the nugget zone (NZ) and heat-affected zone (HAZ) in the weld joints obtained from AISI 1040 steel bottom plate is more significant than that of weld joints obtained using copper bottom plate due to lower thermal conductivity of steel. Also, the weld joints obtained using copper bottom plate have fine grain microstructure due to the dynamic recrystallization. The friction stir welded joints obtained with copper bottom plate have exhibited higher ductility of 8.9% and higher tensile strength of 172 MPa as compared to the joints obtained using a steel bottom plate.

THERMOMECHANICAL ANALYSIS OF THE RESISTANCE SPOT-WELDING PROCESS

2018 ◽  
Vol 10 (5) ◽  
pp. 449-455 ◽  
Author(s):  
Habib Lebbal ◽  
Lahouari Boukhris ◽  
Habib Berrekia ◽  
Abdelkader Ziadi
Keyword(s):  
Resistance Spot Welding ◽  
Spot Welding ◽  
Welding Process ◽  
Thermomechanical Analysis ◽  
Resistance Spot
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