Arc welding

About: Arc welding is a research topic. Over the lifetime, 25393 publications have been published within this topic receiving 168182 citations.

Microstructure and mechanical properties of a thick-section high-strength steel welded joint by novel double-sided hybrid fibre laser-arc welding

Abstract: In this paper, a novel double-sided hybrid fibre laser-arc welding procedure was developed to join 30 mm thick, high-strength steel, and this procedure was compared with conventional double-sided arc welding The welded joint was divided into two zones, the laser zone and the arc zone, and the microstructure and mechanical properties of the welded joint in these zones were investigated in detail The results indicated that the laser zone and arc zone predominately consisted of lath martensite with a high dislocation density The average grain sizes of the laser zone and the arc zone were smaller than that of the base metal The results also indicated that the laser zone and the arc zone possessed higher strength when compared with the base metal because of the fine lath martensite Meanwhile, the strength observed in the laser zone was slightly higher than that of the arc zone due to the small average effective grain size On the contrary, the toughness of the base metal was higher than the toughness in the laser zone and the arc zone because of massive polygonal ferrites Meanwhile, a significant increase in the toughness of the laser zone when compared with the arc zone occurred due to an increase in the prevalence of grain boundaries with large misorientation angles

Arc welding method and arc welding device

Abstract: Disclosed is an arc welding method wherein when a weld-ending signal is input while arcing, the welding wire is accelerated, causing a short between the welding wire and a parent material; thereafter the welding wire is retracted, and when a predetermined wire retraction speed is attained, the wire supply speed is fixed at the predetermined wire retraction speed; after retracting for a predetermined period of time, the supply of welding wire is stopped; and considering the time the short began during retraction of the welding wire as the starting point in time, a fixed, predetermined welding current is output for a predetermined length of welding time, and then welding output is stopped.

An Arc Welding Robot Control for a Shaped Metal Deposition Plant: Modular Software Interface and Sensors

Abstract: This paper is focused on the study and the control of a process of robotic arc welding. The system developed has been used to study the whole process and to develop an automatic controller for the arc process of deposition. The process consists of a shaped metal deposition (SMD) system that is an innovative method for the manufacturing of metal objects, which uses a layer-by-layer deposition technique. A useful software interface has been implemented in a Labview environment to study the system and to develop and tune the parameters of an automatic controller.

A Study on the Three-Dimensional Analysis of Heat and Fluid Flow in Gas Metal Arc Welding Using Boundary-Fitted Coordinates

Abstract: Computer simulation of three-dimensional heat transfer and fluid flow in gas metal arc (GMA) welding has been studied by considering the three driving forces for weld pool convection, that is the electromagnetic force, the buoyancy force, and the surface tension force at the weld pool surface. Molten surface deformation, particularly in the case of GMA welding, plays a significant part in the actual weld size and should be considered in order to accurately evaluate the weld pool convection. The size and profile of the weld pool are strongly influenced by the volume of molten electrode wire, impinging force of the arc plasma, and surface tension of molten metal. In the numerical simulation, difficulties associated with the irregular shape of the weld bead have been successfully overcome by adopting a boundary-fitted coordinate system that eliminates the analytical complexity at the weld pool and bead surface boundary. The method used in this paper has the capacity to determine the weld bead and penetration profile by solving the surface equation and convection equations simultaneously.