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 groove depth and plunge depth on microstructure and mechanical properties of friction stir butt welded AA6061-T6

Abstract: In the present study, a backing plate that characterized by an arc groove was employed in the friction stir butt welding of AA6061-T6 aluminum alloy in order to eliminate root flaws. The effect of ...

Effect of welding sequence and direction on angular distortions in butt-welded plates:

Abstract: During arc welding process, non-uniform heating and cooling lead to non-uniform expansion and contraction of the weld and surrounding base metal which result in undesirable residual stresses and distortions in the welded joint. Among different types of welding distortions, angular distortions produced by butt welding of plates are of major concern in industry. Various methods are currently being used to control and reduce angular distortions. Among different types of distortion control methods the ones which can also reduce residual stresses are preferred. In this paper, the effect of welding sequence and direction on reduction of welding-induced angular distortions in single-pass butt-welded 304 stainless plates and also their effect on residual stresses are investigated by numerical simulation. Welding simulation has been performed using a three-dimensional thermo-elastic–plastic finite element model. In order to verify the numerical model, experiments have also been carried out and temperature historie...

Numerical simulation of residual stresses induced by TIG butt-welding of thin plates made of AISI 316L stainless steel

Abstract: The paper herein presented refers to the numerical simulations of a TIG butt-welding process applied to thin plates made ​​of an AISI 316L austenitic stainless steel. Finite element (FE) thermal analyses were initially carried out in order to obtain the transient temperature distributions in the plates, and, subsequently time-dependent thermal results were used in the FE structural analyses, in order to calculate the residual stresses and deformations introduced by the welding process. A double Gaussian distribution – namely a double ellipsoid -, with front and rear dimension's areas of the arc defined based on real weld bead's measurement, was used as the heat source model (power density), and it was considered that it moved at constant speed. Numerical results calculated were in good agreement with the experimental residual stresses measured by the hole-drilling method, showing the adequacy of the method implemented and its potential to estimate residual stresses and distortions. In fact, it was found a deviation of 19 % for the maximum principal stress calculated, while for the minimum principal stress a deviation value of 9 % was obtained; in addition, the simulated weld bead presented slight deviations from the macrograph sample and the differences related to the depth of the weld pool were around 2%.

Apparatus for butt-welding plastic pipe sections or plastic fittings

Abstract: The invention is a method and apparatus for butt-welding two adjoining plastic tubular members which are held in axially adjustable mountings and which are joined together under axial pressure after heating in the area of their juncture by means of electric heating elements. Welding without formation of an interior bead is made possible with the invention by inserting into the plastic tubular members, prior to heating, a bolster which bridges the juncture and fits flush against the inside curvature of the plastic tubular members, and by applying in the area of the juncture shell-shaped heating elements to the outside of the plastic tubular members to heat the abutting ends of the plastic tubular members from the outside.