Butt welding

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

Numerical simulation of welding-induced distortion in thin-walled structures

Abstract: A sequentially coupled thermal stress analysis approach is presented for modelling temperature and distortion profiles resulting from welding thin-walled structures. The material is modelled as thermo-elastic–plastic with isotropic strain hardening. The heat source is modelled as a three-dimensional (3-D) double ellipsoid, and 3-D finite element (FE) models are employed for predicting ensuing distortions. Comparisons between the simulation results and experiments performed for eight weld configurations are presented. The weld configurations include bead-on-plate, butt weld and tee joint welds with varying plate thicknesses. Temperature measurements using thermocouples and an infrared (IR) imaging radiometer are directly compared to the thermal simulations. Likewise, distortions measured directly on the experimental set-ups are compared to the FE distortion predictions. Very good correlation is obtained for temperature as well as distortion predictions between experimental and proposed numerical a...

One-face resistance welding machine

Abstract: This invention relates to welding machines and in particular to resistance welding machines which operate on one face of the work welded thereby. In the conventional spot or seam welding machines which are mostly built to perform a plurality of welds with the electrodes thereof in electrical...

Investigation of the effect of clamping on residual stresses and distortions in butt welded plates

Abstract: One major disadvantage of many arc welding processes is welding-induced residual stresses and distortions. The non-uniform heating and cooling during arc welding result in non-uniform expansion and contraction of the weld and surrounding base material, which produces undesirable residual stresses and deformations in the welded joint. A number of methods can be used to control welding-induced distortions. The methods used for controlling welding distortions a ect residual stresses and vice versa. One practical method for minimizing welding angular distortions is the use of clamping. In this paper, the e ect of clamping and clamp releasing time on welding residual stresses and distortions in the single-pass butt welding of 304 stainless steel plates are investigated. Cases with and without clamping have been studied, and residual stresses and angular distortions have been predicted by three-dimensional nite element simulation. Moreover, experiments have been carried out to measure temperature histories, angular distortions and residual stresses for the unclamped case to verify the numerical model. The results of this study revealed that clamping and clamp release time have a great in uence on the distribution of residual stresses and nal angular distortions. Using clamping during welding and releasing after cooling to ambient temperature can signi cantly reduce the amount of nal angular distortions.

Method and apparatus for cutting welding steel strips

Abstract: An apparatus, for butt-welding steel strips using a laser beam are disclosed, in which opposite ends of preceding and succeeding steel strips fed continuously are cut and the cut end edges thus formed are welded by butt welding using a laser. The cutting and butting at the time of welding are effected with one edge of the preceeding steel strips adjacent to the opposite ends of the succeeding steel strips aligned to be parallel with the center line of travel of the continuous processing line. When effecting the alignment, the preceding or succeeding steel strip is attracted by an electromagnetic chuck on a work table in the continuous processing line and is pulled by the chuck toward a reference block provided with an alignment edge parallel to the center line of travel of the processing line to bring the edge of the sheet into contact with the reference block. The alignment is done in this state. The work table is capable of being moved along the continuous processing line. A revolving table supports the work table.

Development of a Robot System for Pipe Welding

Abstract: Large amount of stainless steel tubes would be applied in the desalination system. If the tubes are welded manually, there would be a lot of the repeated work accompanied with the extremely low efficiency and the welding quality could not guaranteed either. So the best choice to finish the work is using a robotic welding system. In this paper, a robotic system to be employed in welding the pipes for desalination of sea water is introduced. The robotic system contains four revolute axes and could be mounted on a branch pipe, so it can both maneuver between the pipes and adjust to a wide range of pipes’ diameter. Moreover, it is very convenient to take with for it is compact and lightweight. The mathematical method for calculating of the geometry of welding path of the intersecting cylinders is also explained. The welding robot, a digital welding power and the gas shielded system are included in the welding system. The robot movement is controlled by a micro-controller and it could communicate with the host IPC (industrial personal computer) through RS232. Other devices are directly controlled by the host IPC. Finally, a simulation is taken and the result shows that the welding system is able to meet the requirements.