Arc welding

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

Mechanically assisted droplet transfer process in gas metal arc welding

Abstract: Gas metal arc welding has been generally accepted as the preferred joining technique due to its advantages in high production and automated welding applications. Separate control of arc energy and arc force is an essential way to improve the welding quality and to obtain the projected metal transfer mode. One of the most eVective methods for obtaining separate control is to exert an additional force on the metal transfer process. In this paper, the droplet transfer process with additional mechanical force is studied. The welding system is composed of an oscillating wire feeder. The images of molten metal droplets are captured by a high-speed digital camera, and both the macroscopic appearance and the cross-sectional pro®les of the weld beads are analysed. It is shown that the droplet transfer process can be signi®cantly improved by wire electrode oscillation, and a projected spray transfer mode can be established at much lower currents. By increasing the oscillation frequency, the droplet transfer rate increases while the droplet size decreases. In addition, the improvement in the droplet transfer process with wire oscillation leads to an enhancement of the surface quality and a modi®cation of the geometry of the weld beads that could be of importance for overlay cladding and rapid prototyping based on deposition by welding.

Manufacturing compound structures of metallic and non-metallic materials involves adhesive layer of individual weld/anchor points produced by especially light arc weld process

Abstract: The method involves applying an adhesive layer (3) to a surface (9) of a metal base (2) to which a preferred non-metallic material (5) is to be applied. The adhesive layer consists of individual weld or anchor points (4) produced by a weld process, especially a light arc welding process involving melting a preferably continuous welding wire so that the point is of a preferred ball- or mushroom-like shape. Independent claims are also included for the following: a compound structure of metallic and non-metallic materials.

Automated rapid prototyping combining additive and subtractive processes

Abstract: Additive and subtractive manufacturing processes are combined to produce objects having a desired geometry specified by a computerized description. According to the invention, a software system is provided which is capable of creating both additive and subtractive toolpaths, and automatically distinguishing between regions in which addition and subtraction must occur. The additive manufacturing aspect may include solid-state or fusion welding processes of all types (including but not limited to, arc welding, laser welding, resistance welding, friction welding, friction stir welding, ultrasonic welding, laser cladding, plasma welding), laser material deposition, metal spraying, adhesive bonding, vapor or electrochemical deposition and other processes not listed which may suggest themselves to those knowledgeable in the field. The subtraction aspect of the invention may include, but is not limited to milling and various types of cutting tools suited thereto, lasers, knives, hot wires, arc cutters, plasmas cutters, and other such methods of cutting and removing material as may suggest themselves.