Abstract
As an innovation of the conventional Tungsten Inert Gas (TIG) welding, Keyhole Tungsten Inert Gas (K-TIG) welding is highly efficient, well-known for its penetration ability and welding quality. In this chapter, the K-TIG welding is introduced, including its equipment, operation methods, the influence of welding parameters and application extensions. Then, the keyhole stability rules are discussed, so do the arc forces and heat input. To obtain a deeper insight into the welding process, experiments on Ti alloy are carried out, from which the arc current signal, arc voltage signal and arc acoustic signal are collected synchronously. Some characteristics are extracted from the collected signals, by which the welding process is analyzed quantitatively. After the careful analysis of K-TIG welding process, a welding penetration recognition model is established, which shows a good performance. Finally, to evaluate K-TIG welding, experiments are performed on duplex stainless steels and Ti alloys. The effect of the welding parameters on the weld geometry profile and the misorientation angle distribution of grain boundary are discussed. The microstructure and mechanical properties of weldments are evaluated. All of the testing results verify the perfect performance and welding quality of K-TIG welding.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
