Gas metal arc welding

About: Gas metal arc welding is a research topic. Over the lifetime, 11706 publications have been published within this topic receiving 109555 citations. The topic is also known as: metal active gas welding & GMAW.

Laser Welding of Structural Aluminium

Abstract: This chapter starts with an overview of the fusion welding processes used in aluminium welding and further progresses by analysing in detail the characteristics of laser welding of aluminium Laser sources for welding are available for a few decades but new concepts are coming to the market The chapter addresses the most commonly used lasers for materials processing, CO2 and Nd-YAG (neodymium–yttrim aluminium garnet) and their interaction with aluminium alloys in welding applications More recent laser types are also included, namely fibre lasers and disc lasers as, though only more recently available in the market, their potential is foreseen as being interesting for welding of aluminium Hybrid laser MAG (Metal Active Gas) welding has proven to lead to good results in welding aluminium plates namely for long seam welding

Forecasting process parameters for GMAW-based rapid manufacturing using closed-loop iteration based on neural network

Abstract: During the layered deposition of forming metallic parts with robotic gas metal arc welding, the geometry of a single weld bead plays an important role in determining the layer thickness and dimensional precision of the deposited layer. This paper addresses prediction of welding process parameters for the expected bead geometry with accordance to the adaptive slicing process in rapid manufacturing. The correlation between the process parameters and the bead geometry was established by applying an artificial neural network. A central composite design was employed to conduct experiments for collecting input–output data. A closed-loop iteration system, consisting of a forward model for predicting bead size and a reverse model for forecasting process parameters, was proposed to predict the optimal welding parameters for the desired bead geometry. The results show that the prediction of process parameters obtained from the designed closed-loop iteration system confirms the feasibility of this system in terms of applicability and automation in the additive manufacturing process.

TIG welding method and welding torch therefor

Abstract: A TIG welding method is usually carried out in a manner that a tungsten electrode is inserted into a weld groove portion of a member to be welded, an electric voltage is applied to a current conducting portion provided for the tungsten electrode while flowing a shield gas means to thereby generate an arc between the tungsten electrode and the member to be welded to form a molten pool of the member, a welding wire is inserted into the molten pool, and a welding torch is then operated to perform a welding process In the improvement of the TIG welding method, the shield gas means is composed of an inner shield gas (13) flowing from a periphery of the tungsten electrode (3) to a front end thereof inserted into the weld groove portion (2a) of the member (1a) to be welded and an outer shield gas (14) flowing towards the weld groove angle from an outside of the inner shield gas (13) to prevent the molten pool from being oxidized and to prevent oxygen in air from being involved The TIG welding torch for carrying out the method is specifically provided with the inner and outer shield gas flow means, and further provided with a central shield gas flow means

Plasma-generating method and means

Abstract: An inert gas welding torch is used to create plasma by directing one or more discrete high velocity jet gas streams into a welding arc between the electrode and the workpiece. The plasma stream is controllable with regard to energy content or location by varying the amount or direction of the inert gas flow. The plasma stream is insensitive to variations of arc length, and permits abnormally high current densities in the electrode. When used with consumable electrodes, the invention is useful for casting as well as for deep welding heavy plate materials in a single pass.