Topic
Butt welding
About: Butt welding is a research topic. Over the lifetime, 7153 publications have been published within this topic receiving 44467 citations.
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Patent•
19 Mar 1982
TL;DR: In this paper, a high strength Al alloy consisting of prescribed precentages of Zn, Mg, Cu and one or more among Mn, Cr, Zr etc. and the balance Al with impurities was presented.
Abstract: PURPOSE: To provide a high strength Al alloy consisting of prescribed precentages of Zn, Mg, Cu and one or more among Mn, Cr, Zr, etc. and the balance Al with impurities and having high strength and superior stress corrosion cracking resistance at its flash butt weld zone. CONSTITUTION: This high strength Al alloy consists of, by weight, 3W9% Zn, 0.3W2.5% Mg, <0.6W2.0% Cu, one or more among 0.05W0.6% Mn, 0.05W0.3% Cr, 0.05W0.25% Zr, 0.005W0.25% V, 0.001W0.1% Ti and ≤0.05% B, and the balance Al with impurities. This Al alloy is used to reduce the wieght of a car, a bicycle, etc., and it has high strength, very satisfactory stress corrosion carcking resistance at its flash butt weld zone as well as its base metal part, and superior flash butt weldability. COPYRIGHT: (C)1983,JPO&Japio
16 citations
TL;DR: In this paper, the authors used the concept of Elber's effective stress intensity range, based on the measurements of crack-opening loads, indicates that the crack propagation rates are equivalent in the weld metal, heat-affected zone, and base metal.
Abstract: Rates of fatigue crack propagation were determined for CT specimens taken from the weld metal, heat-affected zone, and base metal of an Alcoa 649A Process 5556 butt weld in a 51-mm (2-in.)-thick 5456-H117 plate. Crack-opening displacement measurements were taken during the fatigue crack propagation tests so that the effects of crack-opening loads and residual stresses could be determined. The use of the concept of Elber's effective stress intensity range, based on the measurements of crack-opening loads, indicates that the crack propagation rates are equivalent in the weld metal, heat-affected zone, and base metal. Furthermore, the effect of stress ratio also can be correlated using the effective stress intensity range concept.
16 citations
Patent•
30 Jul 1981
TL;DR: In this paper, a low-inertia movable welding head coupled to a stationary welding transformer which is of low mutual reactance is used to produce a high-energy pulse of current, of very short time duration.
Abstract: A resistance welding system having a low-inertia movable welding head coupled to a stationary welding transformer which is of low mutual reactance. Through an appropriate timing circuit and control, a high-energy pulse of current, of very short time duration, is transmitted through the welding transformer to the movable welding head. The welding head, which contacts a projection on overlapping components, effects a rapid welding of the components, and the welding head rapidly follows up the melting of the projection due to its low inertia.
16 citations
TL;DR: In this paper, a bottom-up approach was used to select the optimum friction stir weld parameters such as plunge depth, tool rotation speed and traverse speed for butt weld of dissimilar aluminum alloy plates, typically 2024-T351 and 7075-T651.
Abstract: In the present study, optimum friction stir weld parameters such as plunge depth, tool rotation speed and traverse speed for butt weld of dissimilar aluminum alloy plates, typically 2024-T351 and 7075-T651, are investigated using a bottom-up approach. In the approach, optimum FSW parameters are achieved by varying any one parameter for every trial while remaining parameters are kept constant. The specimens are extracted from the friction stir-welded plates for studying the tensile, hardness and microstructure properties. Optimum friction stir weld individual parameters are selected based on the highest ultimate tensile strength of the friction stir-welded butt joint specimens produced by varying in each case one parameter and keeping the other two constant. The microstructure samples were investigated for presence of defects, grain refinement at the weld nugget (WN), bonding between the two materials and interface of WN, TMAZ (thermomechanically affected zone) of both advancing and retreating sides of the dissimilar joints using optical microscopy and scanning electron microscopy analyses. In the experimental investigations, the optimum FSW parameters such as plunge depth, 6.2 mm, rotation speed, 650 rpm and traverse speed of 150 mm/min result in ultimate tensile strength, 435 MPa, yield strength, 290 MPa, weld joint efficiency, 92% and maximum elongation, 13%. The microstructure of optimized sample in the WN region revealed alternate lamellae material flow pattern with better metallurgical properties, defect free and very fine equiaxed grain size of about 3-5 µm.
16 citations