Butt welding

About: Butt welding is a research topic. Over the lifetime, 7153 publications have been published within this topic receiving 44467 citations.

Effect of backing plate material in friction stir butt and lap welding of 6063-T4 aluminium alloy

Abstract: 6063-T4 aluminum alloy plates were friction stir butt and lap welded using three different backing plate materials: mild steel, stainless steel, and asbestos. Effects of backing plate material on macrostructure, peak mid-section temperatures in heat affected and weld nugget zones, and weld mechanical properties were obtained for each of the cases. Effect of backing plate material was seen to be more significant in lap than butt welding. While lap welds obtained even at a low welding speed, for mild steel and stainless steel backing plates, contained multiple weld defects leading to failure in lap shear tests from weld nugget zone, corresponding welds obtained with asbestos backing plate were defect free resulting in failure from base metal region. In butt as well as lap configuration, asbestos backing plate which had the lowest thermal diffusivity was observed to provide the largest process window within which defect free welds could be obtained.

Method for realizing swing welding with laser-GMA electric arc hybrid welding device

Abstract: The invention discloses a method for realizing swing welding with a laser-GMA electric arc hybrid welding device, relating to a laser-melting electrode gas metal arc welding hybrid welding method The method solves the problem that the defects such as incomplete fusion, gas hole and included slag, and the like, are easily existed between a side wall and a layer when welding a moderate plate and a thick plate with the laser-GMA electric arc hybrid welding device The method comprises the following steps of: 1 chamfering; 2 clamping a work piece to be welded; 3 ensuring the positions of an electric arc and a laser beam, wherein the laser beam is perpendicularly irradiated to the surface of the work piece to be welded, an included angle between the electric arc and the laser beam is 15-60 DEG C, and the distance between the laser beam and the sharp end of a GMA electric arc welding wire is 2-6mm; 4 setting a welding technology parameter; and 5 performing the welding, wherein an electric arc welding gun is kept to be immovable when welding, and a laser beam-focused wielding gun swinging welds in the shape of 'S' The method is used for butt welding of a thick plate more than 10mm in national defense and civil use fields of shipbuilding, petroleum pipe lines, high-pressure vessels, fighting vehicles and nuclear devices, etc

Manufacture of two-piece wheel rim having excellent gloss

Abstract: PURPOSE:To satisfy the requirement of gloss of both a mother material and a weld metal at the time of manufacture of a 2-piece wheel rim made of an aluminum alloy by flash butt welding the aluminum alloy of a specific composition followed by heating at a specific temperature. CONSTITUTION:At the time of manufacturing a glossy aluminum alloy 2-piece wheel rim, an aluminum alloy material is used which contains by weight 2.0-5.0% of Mg, 0.05-0.15% of Cu, 0.1% or less of Si, 0.1% or less of Fe, 0.005-0.1% of Ti, 0.0001-0.01% of B, and further one or two kinds of 0.3% or less of Mn, 0.3% or less of Mn, 0.3% or less of Cr, and 0.3% or less of Zr, with the rest comprising Al and inevitable impurities. After flash butt welding the aluminum alloy, it is heat treated at 300-450 deg.C. This provides a 2-piece wheel rim excellent in the strength of the mother material, with both the flash butt weld metal and the mother material being highly glossy after chemical polishing and alumite treatment.

Laser Hybrid Butt Welding of Large Thickness Naval Steel

Abstract: Plates joining is one of the first stage at large vessels manufacturing line, process conditioning the whole shipbuilding production. Laser Arc Hybrid Welding (LAHW) process is nowadays providing promising results for large thickness naval steel, being primarily used for welding plates with thicknesses between 6 to 15 mm, reaching up to 51 mm. In addition to this high penetration ability, LAHW allows increasing the production rates. Therefore, this technology is proposed as an alternative to conventional welding processes in shipbuilding, as it integrates the advantages of laser and arc welding, providing high process stability, high welding speed and penetration, narrow weld beads with a low heat input and good metallurgical properties. The present review reports the most representative investigation regarding the use of this technology to join large thickness flat panels of naval steel. It includes a summary of the most influential process variables, equipment characteristics, material properties, naval regulations, as well as microstructural characterisation and mechanical properties of joints. This review is thought to help readers from different backgrounds, covering from non-expert on welding or on naval sector, to industrial LAHW applicators and researchers. The industrial need of performing one single pass procedure to assure high quality welds of high thickness is suggested as one of the key aspects for future investigations.