Topic
Butt welding
About: Butt welding is a research topic. Over the lifetime, 7153 publications have been published within this topic receiving 44467 citations.
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TL;DR: An integrated optimization approach by combining Kriging model and GA is proposed to optimize process parameters in hybrid laser-arc welding as mentioned in this paper, where the effects of process parameters on weld geometry are analyzed.
Abstract: It is of great significance to select appropriate welding process parameters for obtaining optimal weld geometry in hybrid laser-arc welding. An integrated optimization approach by combining Kriging model and GA is proposed to optimize process parameters. A four-factor, five-level experiment using Taguchi L 25 is conducted considering laser power (P), welding current (A), distance between laser and arc (D) and traveling speed (V). Kriging model is adopted to approximate the relationship between process parameters and weld geometry, namely depth of penetration (DP), bead width (BW) and bead reinforcement (BR). The constructed Kriging model was used for parameters optimization by GA to maximize DP, minimize BW and ensure BR at a desired value. The effects of process parameters on weld geometry are analyzed. Microstructure and micro-hardness are also discussed. Verification experiments demonstrate that the obtained optimum values are in good agreement with experimental results.
56 citations
TL;DR: In this paper, the effect of residual stresses and weld geometry on the fatigue life of butt welded joints was studied by developing an analytical model using Linear Elastic Fracture Mechanics (LEFM), superposition and finite element approaches.
56 citations
Patent•
13 Jun 1985
TL;DR: In this paper, a method of producing butt welds between pipes or ducts of fluoropolymers, which are extremely chemically inert and which have continuous service temperatures in the range of 300 to 500°F (149 to 260°C) or more, by simultaneously applying infrared or radiant heat to the ends of the pipes or fittings to be welded but without touching the ends being radiated.
Abstract: The present invention teaches a method of producing butt welds between pipes or ducts of fluoropolymers, which are extremely chemically inert and which have continuous service temperatures in the range of 300 to 500°F (149 to 260°C) or more, by simultaneously applying infrared or radiant heat to the ends of the pipes or fittings to be welded but without touching the ends being radiated. The radiant heat is derived from a flat faced electric quartz infrared heater which has a surface temperature in excess of 1600°F (871°C) and which is maintained for fifteen to forty-five seconds at a spacing of approximately one-fourth to one-half of an inch (6.35 to 12.7 mm) from the end face of the duct. The time varies with the size of the pipe being welded; and the heater to pipe spacing may vary widely, from 0.125 inch (3.175 mm) to as much as 2.0 inches (50.8 mm).
55 citations
TL;DR: In this article, an adaptive line growing algorithm is proposed for robust identification of weld joints regardless of the shape of the seam, surface finish and surface imperfections such as scratches, mill scale and rust.
Abstract: One of the main challenges for robotic welding in low to medium volume manufacturing or repair work is the time taken to programme the robot path for a new job. It is often cheaper and more efficient to weld the parts manually. There are many papers published on the detection of butt welds, however there is no mature method for the identification of fillet welds which are more common. This paper presents a novel method that can autonomously identify fillet weld joints regardless of the base material, surface finish and surface imperfections such as scratches, mill scale and rust. The new method introduces an adaptive line growing algorithm for robust identification of weld joints regardless of the shape of the seam. The proposed method is validated through experiments using an industrial welding robot in a workshop environment. The results show that this method can detect realistic fillet weld joints for industrial arc welding applications.
55 citations
TL;DR: Laser welding and one-piece castings of three units were found to be significantly superior to soldering and the laser welding was most reliable.
Abstract: This study was conducted to evaluate objectively the relative distortion in three-unit bridges joined by laser welding, soldering, or one-piece casting techniques, Each procedure was replicated five times. Laser welding and one-piece castings of three units were found to be significantly superior to soldering. The laser welding was most reliable.
55 citations