Electron beam welding of sheet commercial titanium VT1-0, hardened by nitrogen in the process of arc-slag remelting, and properties of produced joints

Abstract

Shown is the efficiency of application of electron beam welding (EBW) for producing full-strength welded joint of commercial titanium rolled metal of 35 mm thickness, hardened by nitrogen of up to 0.1 wt.% in the process of arc-slag remelting (ASR). Data of X-ray spectral analysis prove the uniform distribution of nitrogen, aluminium, titanium, iron, oxygen both in the ASR rolled metal and also in the welded joint. Metallographic examinations confirmed the producing of quality welded joint without cracks, pores and other defects. Weld metal and base metal are characterized by a homogeneous structure. The uniform distribution of hardness HB and microhardness HV was observed both in the sheet commercial titanium and also in the welded joint. At content of nitrogen of up to 0.1 wt.% in titanium the hard inclusions of titanium nitride are absent both in the sheet ASR rolled metal and also in the weld metal made by the EBW. 13 Ref., 5 Figures. K e y w o r d s : commercial titanium, arc-slag remelting, titanium hardening with nitrogen from gas phase, sheet rolled metal, electron beam welding, macro-and microstructure, mechanical properties of welded joint

Laser welding of commercial arc slag remelted titanium VT1-0 hardened by nitrogen

“…Earlier [5], the efficiency of application of electron beam welding to produce welded joints of full-strength with base metal (BM) of sheet commercial titanium VT1-0 of 35 mm thickness, hardened by nitrogen up to 0.1 % from gas phase in ASR process, was shown. Metallographic investigations proved the production of the quality welded joint without cracks, pores and other defects, in spite of the fact that the real content of nitrogen (0.098 %) in BM almost 2.5 times exceeds the admissible (≤0.04 %) content in VT1-0 titanium according to GOST 19807-74.…”

Manufacture of rods of sintered titanium alloys by using different methods of welding (Review)

“…The recent investigations show that the strength factor in argon arc welding makes 0.93-0.97 [31], and in argon arc welding into narrow and traditional gaps with reinforcement [37] the full strength of titanium alloy welded joints is provided. The full strength is also provided in fusion welding by the concentrated power sources: electron beam [37][38][39], laser [40,41] and plasma [41]. However, these methods have a number of techno-logical and economic drawbacks, typical of all the methods of liquid-phase welding.…”