Abstract The current research of narrow-gap gas metal arc welding (NG-GMAW) primarily focuses on improving the sidewall fusion and avoiding lack-of-fusion defect. However, high cost operation difficulty methods limit industrial application. In this study, small amount active gases CO 2 O were added into pure argon inert shielding to improve weld formation pulsed-current mild steel. Their effect...

This study aims to determine the variation of metal transfer on tensile strength, impact, hardness distribution, macrostructure, microstructure and chemical composition low carbon steel by GMAW welding method. The material used in this was AISI 1018 steel. welded using Variation globular arc, spray arc short welding. tests carried out included testing, impact macro-structural observations, micr...

Control of the Gas Metal Arc welding process is becoming increasingly sophisticated, due to improvements in technology and a better understanding of the process itself. To effectively conduct research in this area, it is necessary to have equipment that is extremely flexible in both architecture and operation. Experimental power sources and a welding test facility have been developed at the Uni...

Thick-walled X80 pipelines for oil and gas transportation are difficult to relocate due their large size. In the process of narrow-gap overhead welding, welding defects, such as bulges lack sidewall fusion, can appear easily. To avoid these defects improve quality thick-walled pipelines, GMAW method is adopted in this paper. The formation characteristics weld influence arc oscillation parameter...

Ultra-high-strength steel (UHSS) is a complex and sophisticated material that allows the development of products with reduced weight but increased strength can assist, for example, in automotive industry, saving fuel vehicles decreasing greenhouse gas emissions. Welding UHSS has certain complexity, mainly due to higher alloys heat treatments involved, which result microstructure sensitivity wel...

Nominated for Eurosteel 2021 Best Paper Award Additive manufacturing (AM) is playing an increasing role in the production of complex steel structures. Robot- or machine-guided gas-shielded metal arc welding (GMAW), known as wire and additive (WAAM), suitable this purpose. A small footbridge was designed shell form at TU Darmstadt. It completely additively manufactured over a stream on site usin...

Friction stir welding (FSW) is an emerging manufacturing technology for aerospace structures. It will see widespread use in the future as it offers ways of creating lighter structures at lower manufacturing cost than traditional methods (riveting, adhesive bonding). Since its invention in 1991, FSW has known fast improvements and many studies have demonstrated its capability for joining a wide ...

Process This chapter presents the principle of tungsten inert gas (TIG) welding process besides important components of TIG welding system and their role. This process is also known as gas tungsten arc welding (GTAW) process. Further, fundamentals of heat generation, arc stability and arc efficiency have also been described. Additionally, comparison of argon and helium as shielded gases has bee...

The desire to generate a stress optimised structural node with maximum stability is often coupled the goal of low manufacturing costs and an adapted minimal use material. complex, three-dimensional free-form structures, which are created by means topology-optimisation, only partially suitable for conventional manufacturing. wire arc additive (WAAM), welding processes, offer cost-effective flexi...