Arc welding

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

Comparison of properties of coatings produced by laser cladding and conventional methods

Abstract: Wear resistant coatings of hardfacing alloys can be produced with powders by using various techniques such as laser cladding (LC), plasma transferred arc (PTA) welding, atmospheric plasma spraying ...

Short circuit transfer arc welding machine

Abstract: A short circuiting arc welding machine increases an arc current density by adding a pulsed current having upper and lower limits to a current flowing when an arc is produced, thereby increasing the depth of bead penetration into a workpiece, removing welding defects, and speeding up the welding operation. The welding machine is capable of alternately changing the direction of flow of a welding current at desired periods to produce arcs in straight, reverse and mixed polarities for achieving intermediate characteristics of arcs of straight and reverse polarities, with a resultant ability to adjust in a wide range a wire melting rate and the amount of heat applied to the workpiece.

Welding of nickel-base superalloys having a nil-ductility range

Abstract: An article made of a nickel-base superalloy having a nil-ductility range from the solidus temperature of the alloy to about 600° F. below the solidus temperature is welded, as for example in the weld repair of surface cracks, by removing foreign matter from the area to be welded, first stress relieving the article, adjusting the temperature of the article to a welding temperature of from about 1800° F. to about 2100° F., welding a preselected area in an inert atmosphere at the welding temperature, and second stress relieving the article. Welding is preferably accomplished by striking an arc in the preselected area so as to locally melt the alloy in the preselected area, providing a filler metal having the same composition as the nickel-based superalloy of the article, and feeding the filler metal into the arc so that the filler metal is melted and fused with the article to form a weldment upon solidification.

Finite element analysis of thermal tensioning techniques mitigating weld buckling distortion

Abstract: The use of welding in fabricating large structures offers advantages over mechanical joining methods in flexibility of design, weight and cost savings, and enhanced structural performance. However, in large structures made of relatively thin section components, welding can cause buckling, which can lead to loss of dimensional control and structural integrity. Weld distortion in thin section structures is usually caused by buckling due to the residual stresses. In addition to conventional techniques, such as reduction of weld size and design modifications, new techniques such as thermal tensioning can be used to minimize welding induced buckling. This paper presents a finite element analysis model of the thermal tensioning technique. A series of finite element simulations and corresponding experiments are performed to demonstrate the technique. Thermocouple measurements are performed to verify the transient thermal analyses and blind hole drilling measurements to verify the predicted residual stresses. Implementing the thermal tensioning conditions determined by the finite element simulations, the residual stresses of large size and high heat input welds are reduced below the critical buckling level.