Butt welding

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

Development of Two-electrode Electrogas Arc Welding Process

Abstract: Electrogas arc welding (EGW) is used for vertical position welding of sheer strakes and hatch side coamings of container ships because of its higher welding efficiency. However, in ordinary welding processes for ultra-thick steel plates, defects such as the lack of fusion are likely to occur. In order to solve this problem and others, a two-electrode VEGA ® (Vibratory Electrogas Arc Welding) process was developed by the authors. This paper provides an outline thereto and describes the essential characteristics of this newly developed process for vertical position welding on extraheavy-sectioned steel plates. It was demonstrated that the VEGA ® process achieves a stabilized fusion-line profile for ultra-thick steel plates with higher welding efficiency. It was then confirmed that joint performance in this study satisfies regulations such as class NK KEW53 and KEW53Y40.

Method and system for laser welding of two or more overlapped metal sheets, and device for clamping the sheets used in this method

Abstract: Welding of two or more steel sheets, at least one of which has a protective layer of a material with a low vaporization temperature, is carried out by directing a laser beam on two overlapped flanges of the sheets, which are clamped in position during welding by means of clamping devices. These clamping devices are able to hold the flanges to be welded in a slightly spaced apart position from each other, so as to create a gap, which does not jeopardize the possibility of carrying out the welding while enabling evacuation of the vapours of the protective material, which are generated during welding.

Microindentation testing of inhomogeneous microstructures in welded polyethylene

Abstract: A microcomputer controlled microindenter with a flat cylindrical microindenter face has been used to measure the variation of storage modulus and loss factor that results from differences in microstructure in high density polyethylene (HDPE). The microstructural variations have been produced by butt welding the polyethylene and varying the thermal histories of the weld. The dynamic mechanical thermal analysis data from the microindenter have been compared to similar tests on uniform bulk material run in bending using a commercial analyzer. The normalization procedure used on the microindenter data was justified by examining the calculated stress fields under the indenter tip. The quantities measured using the microindenter are consistent with the measured changes in crystallinity.

Magnetically impelled arc butt welding of pipelines

Abstract: The present invention is a method and a vehicle-mounted apparatus (30) for laying pipelines in which adjacent pipe (17, 28) are joined by the technique of magnetically impelled arc butt welding (MIAB). A MIAB welding head (13) having a welding axis is mounted on a transportable platform (35). A pipe guide (50) capable of engaging a welded pipe string is located rearwardly of the welding head (45). The pipe guide (50) maintains alignment of the string with the welding axis. The apparatus includes pipe feed means (47, 48, 49) maintaining alignment of a next pipe to be laid with the welding axis and the pipe string (17). The platform (37) is rotatably mounted on the vehicle (30) and tilts around a horizontal axis. The vehicle (300) is provided with pivoting steerable tracks (38).