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 arc hybrid welding method for surface coated metal parts, the surface coating containing aluminium

Abstract: The process of welding a steel part (1) by a laser beam, comprises combining the laser beam with an electric arc to operate a fusion of the metal and the welding of parts. The steel part has a coating surface (2) having aluminum (90%) and silica (10%) and a thickness of 30 mu m. The part has a thickness of 0.8-2.5 mm, and comprises a deposit of aluminum or silica on the surface of a side edge (1a) before welding the part. An arc is delivered by a welding electrode with tungsten, or formed at an end of the fusible wire. A gaseous protection of the part is maintained during welding. The process of welding a steel part (1) by a laser beam, comprises combining the laser beam with an electric arc to operate a fusion of the metal and the welding of parts. The steel part presents a coating surface (2) having aluminum (90%) and silica (10%) and a thickness of 30 mu m. The part has a thickness of 0.8-2.5 mm, and presents a deposit of aluminum or silica on the surface of a side edge (1a) before welding the part. An arc is delivered by a welding electrode with tungsten, or formed at an end of the fusible wire. A gaseous protection of the part is maintained during welding. The laser beam is generated by a laser generator of carbon dioxide and neodymium-doped yttrium aluminum garnet with diodes or an ytterbium fiber.

Low-cost open-source voltage and current monitor for gas metal arc weld 3D printing

Abstract: Arduino open-source microcontrollers are well known in sensor applications for scientific equipment and for controlling RepRap 3D printers Recently low-cost open-source gas metal arc weld (GMAW) RepRap 3D printers have been developed The entry-level welders used have minimal controls and therefore lack any real-time measurement of welder voltage or current The preliminary work on process optimization of GMAW 3D printers requires a low-cost sensor and data logger system to measure welder current and voltage This paper reports on the development of a low-cost open-source power measurement sensor system based on Arduino architecture The sensor system was designed, built, and tested with two entry-level MIG welders The full bill of materials and open source designs are provided Voltage and current were measured while making stepwise adjustments to the manual voltage setting on the welder Three conditions were tested while welding with steel and aluminum wire on steel substrates to assess the role of electrode material, shield gas, and welding velocity The results showed that the open source sensor circuit performed as designed and could be constructed for <$100 in components representing a significant potential value through lateral scaling and replication in the 3D printing community

Method of welding

Abstract: A process for buttwelding metal workpieces (12) having bevelled joint preparations using an automatic GTAW welder (20) using filler wire (32) includes preparing the bevelled workpieces (12) with bevelled joint areas having minimal land thickness at the root extremities; placing the prepared workpiece joint sections together with an open gap between their adjacent root extremities, the gap having a minimum dimension that avoids harmful compression stress between the workpieces due to weld shrinkage and a maximum dimension that avoids filler wire penetration of the gap; fusion welding the open root area of the adjacent workpieces (12) with a root pass weld using an automatic GTAW welder (20) supplied with filler wire (32) and a shield gas including 1 to 10 % hydrogen and the balance inert gas; and then promptly overlaying the root pass weld with at least one additional filler weld pass using an automatic GTAW welder (20) supplied with filler wire (32) and hydrogen-free shield gas.

Method for the ultrasonic welding of wires on the metal surface of a support

Abstract: A method of and a device for the ultrasonic welding of wires comprising a non-metal insulating layer on the metal surface of a support by means of a welding tip which is made to vibrate in a direction parallel to the longitudinal direction of a wire to be welded; according to a previously programmed welding cycle, the insulating layer is first removed locally and the wire is then welded; a preceding mechanical or chemical cleaning of the wires is not necessary. The method according to the disclosure provides a welded joint which has compact dimensions and a high mechanical strength.

Gas Metal Arc Welding

Abstract: Gas metal arc welding (GMAW), sometimes referred to by its subtypes metal inert gas (MIG) welding or metal active gas (MAG) welding, is a semi-automatic or automatic arc welding process in which a continuous and consumable wire electrode and a shielding gas are fed through a welding gun. A constant voltage, direct current power source is most commonly used with GMAW, but constant current systems, as well as alternating current, can be used. There are four primary methods of metal transfer in GMAW, called globular, short-circuiting, spray, and pulsed-spray, each of which has distinct properties and corresponding advantages and limitations.