Topic
Heat-affected zone
About: Heat-affected zone is a research topic. Over the lifetime, 18787 publications have been published within this topic receiving 231744 citations.
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TL;DR: In this paper, the influence of welding phenomenon on the microstructure, micro-hardness, tensile properties, surface and sub-surface residual stress distribution and deformation and distortion of both the weldments were studied.
57 citations
TL;DR: In this article, a mathematical model was established to simulate the weld pool development and dynamic process in stationary laser-metal inert gas (MIG) hybrid welding, where surface tension and buoyancy were considered to calculate liquid metal flow pattern.
Abstract: A mathematical model was established to simulate the weld pool development and dynamic process in stationary laser–metal inert gas (MIG) hybrid welding. Surface tension and buoyancy were considered to calculate liquid metal flow pattern; moreover, typical phenomena of MIG welding such as filler droplets impinging weld pool, electromagnetic force in the weld pool, and typical phenomena of laser beam welding such as recoil pressure, inverse Bremsstrahlung absorption, and Fresnel absorption were all considered in the model. The laser beam and arc couple effect was introduced into this model by the plasma width during hybrid welding. Transient weld pool shape and complicated liquid metal velocity distribution from two kinds of weld pool to a unified weld pool were calculated. Furthermore, the simulated weld bead geometries were in good agreement with experimental measurement.
57 citations
TL;DR: In this paper, the fusion zone of laser welded QP980 composed of fully martensitic structure exhibited high hardness (493 Hv), while the sub-critical heat affected zone contained partially tempered martensite with a hardness drop (21※Hv).
57 citations
TL;DR: In this article, the effect of three welding processes on fatigue crack growth behavior is reported in AA2219 aluminium alloy square butt joints without filler metal addition were fabricated using gas tungsten arc welding (GTAW), electron beam welding (EBW), and friction stir welding (FSW) processes.
57 citations
TL;DR: In this article, the optimal welding parameters at welding positions from 180° to 360° were obtained by numerical optimization using response surface methodology (RSM) based on central composite design (CCD).
Abstract: Oscillating arc narrow gap all-position gas metal arc (GMA) welding is primarily applied for the construction of large metal structure with the advantages of high efficiency and quality. According to the characteristic of weld shape, oscillating arc narrow gap all-position welding process can be divided into two parts, namely 0–180° and 180–360°, and in this paper the welding process of part 180–360° was researched. The statistical models for weld geometry were developed to predict and optimize weld bead geometry by using response surface methodology (RSM) based on central composite design (CCD), and the developed models were checked for their adequacy and significance by ANOVA. Then, the effects of wire feed rate, travel speed, dwell time, oscillating amplitude, and welding position on weld bead dimension were studied. Finally, the optimal welding parameters at welding positions from 180° to 360° were obtained by numerical optimization using RSM.
57 citations