Butt welding

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

Measurement of the Temperature Rise at the Welding Surface of Different Metal Specimens Joined by a 15 kHz Ultrasonic Butt Welding System

Abstract: The temperature rise at the welding surface of different metal specimens joined by a 15 kHz ultrasonic butt welding system is studied. The welded zone of the ultrasonic welding is limited to a very thin area and a clear melted structure cannot be observed and also the temperature rise at the welding surface cannot obtained by clearly measured. Temperature rises at the welding surfaces of different metal specimens are measured directly by the thermoelectromotive force between them, using a system with a small time constant. The temperature rises are measured using a 15 kHz ultrasonic butt welding with which it is possible to join the welding specimens directly end to end. Aluminum, copper and steel plates of 6 mm thickness were successfully joined end to end. The measured temperature rise rate is very high at the initial welding stage and decreases, or the temperature saturates, as the welding process progresses and the welding strength increases.

Effect of the welding sequence in the circumferential direction on residual stress distribution in a thin-walled pipe weld

Abstract: This paper presents a three-dimensional (3D) finite element (FE) analysis to investigate the influence of the welding sequence in the circumferential direction on residual stress distribution in a thin-walled carbon steel pipe weld Single-pass butt-welded joint geometry with an outer diameter of 300 mm and a thickness of 7 mm is studied A 3D uncoupled thermomechanical FE model is developed in order to incorporate the 3D features and the welding sequence in the steel pipe weld The thermomechanical model is described and details of the analysis methodology are provided Six different welding sequences in the circumferential direction considering actual welding circumstances are employed, and it is shown that the residual stresses within and near the weld deposit are generally influenced by the welding sequence The variations are not large, however, thus the benefits arising from the change of the residual stresses in and around the weld area are offset by the potential drawback of the several st

Numerical and experimental study on butt weld with dissimilar thickness of thin stainless steel plate

Abstract: Systematic numerical investigation is performed to study the effects of different case studies on butt welding of dissimilar thicknesses plates which is a normal type of welding geometry in shipyards. To start with, the numerical study of thermo-mechanical analysis is verified by experimental test results reported in this paper. In the experiment, two stainless steel plates with 2.5 and 4 mm thicknesses are welded with single-pass butt welding with GMAW. The numerical investigation is conducted with eight different case studies, belonging to three different groups to evaluate the effects of each case on the structural response. These eight cases are grouped according to the heat input position, welding parameters, and different ratios between thicknesses. It is concluded from the results that the changing ratio between thicknesses has a significant effect on the structural response.

Control system and method for vibration welding

Abstract: A displacement transducer is used to continuously monitor the distance between two fixtures securing parts to be welded. The signal from the displacement transducer is used to stop the welding process when a desired amount of material has been extruded from the weld. The control strategy will automatically take into account part nonuniformities that normally result in poor welds in welding processes that use time as the control variable.