Butt welding

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

Conductive heat resistance seam welding

Abstract: A welding arrangement (10) consists of first and second parts to be welded (4a, 4b) with a portion of the first part and a portion of the second part juxtaposed to form a weld zone (8a, 8b). An electrically-conductive sheet (2) with a higher melting temperature than a a melting temperature of the first pan (4a) and a melting temperature of the second part (4b) is placed over the weld zone (8a, 8b). A first electrode (12) is placed in contact with the electrically conductive sheet material (2) and a second electrode (14) is positioned and aligned with the first electrode (12) to heat conductively the weld zone (8a, 8b) with an electrical current. For the butt weld configuration (10), a second electrically conductive sheet (6) is placed between the second electrode (14) and the weld zone (8a, 8b).

Mobile rail welding machine

Abstract: A mobile rail welding machine comprises a frame, a hydraulically driven flash butt welding device, a "Thermit" welding unit and preferably an electric arc welding device mounted on the frame for selectively flash butt welding, "Thermit" welding or arc welding abutting rail section ends of a track rail, and a weld burr removal device adjustably mounted on the frame for selectively removing weld burrs at either rail.

Finite element study of 3D simulated welding effect in aluminium plates

Abstract: The effects of metal inert gas (MIG) welding and friction stir welding (FSW) on the development of the heat-affected zone (HAZ), residual stress and distortion fields in aluminium plates were investigated in this paper. The FSW and MIG butt welding process of two aluminium alloy 6061-T6 plates were simulated in a three-dimensional, two-step thermo-mechanical analysis using the finite element code ANSYS. The element birth and death technique was implemented in the MIG simulation to model the addition of weld metal to the workpiece and the tool plunging force and fixture release were considered in the FSW simulation. The finite element thermal results revealed that the FSW process resulted in significantly lower temperatures in comparison with MIG welding. The mechanical results indicated that in comparison with MIG welding, the FSW process resulted in up to 40% and 75% less peak tensile and compressive residual stresses, respectively, as well as a reduction of 40%– 60% in HAZ area and considerably smaller ...

Method for Welding a Workpiece

Abstract: The invention describes a method of welding a workpiece (16) having a consumable welding wire (13) which is moved essentially in the direction of the workpiece (16) during a welding process by means of a wire feed unit (11), wherein a process for removing slag (42) at the end of the welding wire (13) is started and carried out. To provide a welding process which is not impaired by slag (42) possibly adhering to that end of the welding wire (13) which is to make contact and ensure reliable striking of the arc (15), provision is made for the welding current (I) to be reduced to a minimum at the start of the slag-removal process, and for the welding wire (13), during the slag-removal process, to be moved cyclically with a rapid recurring forward/backward movement by a predetermined displacement length in the direction of the workpiece (16) and by a smaller displacement distance away from the workpiece (16) again until a short circuit between the welding wire (13) and the workpiece (16) is detected by short-circuit monitoring, whereupon the slag-removal process is ended.

Fatigue crack propagation in butt welds containing joint penetration defects

Abstract: FATIGUE TESTS HAVE BEEN CONDUCTED ON LOW CARBON STEEL BUTT WELDS CONTAINING JOINT PENETRATION DEFECTS (LESS THAN COMPLETE JOINT PENETRATION). THE GROWTH OF FATIGUE CRACKS FROM SIMULATED PENETRATION DEFECTS WAS MONITORED BY RADIOGRAPHY. THESE MEASUREMENTS ALLOWED THE TOTAL FATIGUE LIFE TO BE SEPARATED INTO PERIODS OF CRACK INITIATION AND CRACK PROPAGATION. THE INITIATION PERIOD WAS FOUND TO OCCUPY APPROXIMATELY ONE-HALF OF THE TOTAL FATIGUE LIFE AND CONSISTS OF THE CYCLES NECESSARY TO SHAKE DOWN THE RESIDUAL STRESSES IN THE WELD AND TO FORM THE PENETRATION DEFECT INTO AN ACTIVE FATIGUE CRACK. /AUTHOR/