Butt welding

About: Butt welding is a research topic. Over the lifetime, 7153 publications have been published within this topic receiving 44467 citations.

Microstructure and mechanical properties of aluminium alloy 7A52 thick plates welded by robotic double-sided coaxial GTAW process

Abstract: The high strength aluminium alloy 7A52 thick plate is commonly welded by double-V butt welding. The general one sided arc welding requires indispensable root cleaning before the rear side root weld, which consumes excessive time and cost. Thus the robotic welding is always difficult to be carried on. In this paper, a novel robotic double-sided coaxial GTAW process has been applied to the welding of Al7A52. The microstructure and mechanical properties of the thick weld joints both welded by robotic self-fluxing double sided coaxial GTAW (RSF-DSC-GTAW) and robotic wire-feed double sided coaxial GTAW (RWF-DSC-GTAW) has been investigated. It was found that the microstructures of weld zones of both processes typically consist of α (Al) and β (MgZn 2 ) phases. Moreover, the weld zone of the RWF-DSC-GTAW joint exhibits Interval layers distribution because of the less proportion of β phase. The average micro hardness in the weld zone of RSF-DSC-GTAW joints and RWF-DSC-GTAW joints are 91.9 HV and 80.1 HV, respectively. With a better elongation property, the average ultimate tensile strength of RSF-DSC-GTAW joint is 344 Mpa. While it is 244 Mpa for the RWF-DSC-GTAW joint. It is considered that the mechanical properties of the RSF-DSC-GTAW joint are more superior to the RWF-DS-GTAW joint.

Welding control arrangement

Abstract: An apparatus for controlling the application of weld metal in electric calarc welding includes a mechanical scanning device upstream from the welding torch. The scanning device penetrates into the welding groove and measures at least one physical dimension thereof which is converted into signals for controlling the welding material feed.

Copying welding equipment

Abstract: A copying welding machine, wherein right and left running wheels are supported on a pair of bearing units pivotally installed on a vehicle, respectively, and drivingly running power source, a driving force transmission mechanism transmitting the rotation of the drivingly running power source to the right and left running wheels, a welding torch, a sensor detecting the route of welding, a control motor normally and reversely rotated by receiving a signal detected by the sensor, and a steering mechanism rotating the bearing units according to the amount of rotation of the control motor, whereby various types of automatic weldings including not only a fillet welding between a steel plate and an erected wall on the steel plate but also a butt welding between steel plates can be performed.

Mechanical properties of 5083, 5059 and 7020 aluminium alloys and their joints welded by fsw

Abstract: The article presents the research results on the mechanical properties of aluminum alloy 7020 and its friction stir welded (FSW) joints. For comparison alloy 5083 – the most currently used in shipbuilding alloy was chosen as well as 5059 - the new high-strength alloy. Besides the native material alloys there were investigated their joints welded by FSW - the same method as alloy 7020. Welding parameters used for the connection of the sheets made of 7020, 5083 and 5059 alloys were presented. Metallographic analysis showed the correct construction of structural bonded joints. Friction Stir Welding (FSW) – a new technology can be successfully used for butt welding of different types of aluminum alloy sheets. FSW method can be an alternative to traditional arc welding methods i.e. MIG or TIG. The research was carried out using a static tensile test in accordance with the requirements of the Polish Standards PNEN ISO 4136:2011 and PN-EN ISO 6892-1:2010. Flat samples cut perpendicular to the direction of rolling were used. The research was conducted at the temperature of + 20oC. The 7020 alloy has higher strength properties then alloys: 5083 and 5059. The yield stress is higher by 14.8% compared to 5083 alloy, and by 11.7% compared to the alloy 5059. Plastic properties of an alloy 7020 are the lowest, but with reserves meet the requirements of classification societies. The joints welded by FSW of 7020 alloy have higher strength properties then joints of alloys: 5083 and 5059. The yield stress achieves the highest value for alloy 7020 and is 24.2% higher than for 5083 alloy and 11.5% for the 5059 alloy. Despite the strength properties also plastic properties are best for 7020 alloy joints.