Butt welding

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

Thermal Analysis Simulation for Laser Butt Welding of Inconel625 Using FEA

Abstract: Laser welding process is employed in the manufacturing of critical components where the final assembly units necessitate strict tolerances like low distortions and residual stresses. Laser beam welding offers several advantages like low heat input, very narrow heat affected zone, low residual stresses, low distortions and good mechanical joint properties in the weld joints when compared to the conventional techniques like Tungsten Inert Gas Arc welding processes. However, the implementation of laser beam welding holds certain challenges like process parameters optimization, experimental set-up and handling and expensive costs. In order to minimize the complex experimental process, simulation techniques using Finite Element Methods (FEM) are employed in order to estimate the heat input and weld process optimization prior to the experiments. This greatly helps in the optimization and estimation of the incurred stresses and distortions with the adapted weld process with known input weld process parameters. The present work reports the Gaussian heat source model for the laser welding of Inconel 625 Alloy plates. The developed moving heat source model is presented and demonstrated with the thermal profiles in terms of the thermal histogram, temperature profiles in the joint cross sections through welded region, interface across the joints.

Double pulse laser welding of 6082 aluminium alloys

Abstract: Double pulse laser welding is investigated to reduce hot cracking in 6082 aluminium alloy welds. Therefore, Nd:YAG and diode laser pulses are superimposed and synchronised with a specific delay. The diode laser heats the parent metal and weld metal during weld spot solidification to compensate for solidification shrinkage and thermal contraction. The results of conventional pulsed laser welding prove that hot cracking is strongly dependent on the pulse peak power of the Nd:YAG laser, which constrains the crack free penetration depth. Adding the diode laser pulse at a defined time during weld spot solidification eliminated hot cracking. The double pulse welding method allowed the butt welding of 0·5 mm thick 6082 aluminium alloys without the formation of hot cracking.

Welding machine and relative operating method

Abstract: A welding machine (1) having a welding unit (2) for generating a welding voltage/current, and at least one welding tool (3) connectable to the welding unit (2) by a cable (4) and supplied by the cable with welding voltage/current; the welding unit (2) has a closed protective casing (5), and a cooling unit (8) for cooling the welding tool (3) and/or cable (4) on command; and the welding machine also has a modular unit (16) containing the cooling unit (8) and insertable stably and in easily removable manner inside the casing (5) which is closed for protection of the welding unit (2), so as to be easily extracted and detached from the casing (5).