Peculiarities of welding process using metal cored wire of TMV5-mk grade

Abstract

Cored wires are used in numerous welding processes with or without external gas or flux shielding. Submerged arc welding (SAW) with cored wires, seamed or seamless, for joining mild and low alloyed steel grades is a technique that has demonstrated clear advantages during the three last decades. Ever since its invention, the SAW process has evolved with one main goal: to combine quality with productivity. With low alloy wires, the benefits have already been clearly demonstrated and widely exploited. However, little has been written on SAW and cladding with cored wires for corrosion or heat resisting applications. Its extension to high alloy compositions brings corresponding benefits and adds some specific and unique features. This paper focuses on consumable specificities and on the quality and productivity features of SAW with CRA (corrosion resistant alloy) cored wires. It describes the potential as well as the limitations of this technique. Cored wires are now used for submerged arc welding of almost all stainless steels ranging from soft martensitic to super-duplex, and for a series of nickel base compositions as well as for cladding cobalt base alloys. Examples of industrial applications with austenitic, duplex, martensitic and heat resisting stainless steels are given to illustrate the potential of the cored wire solution. 13 Ref., 4 Tables , 25 Figures.

Development of Self-Shielded Flux-Cored Wires for Arc Welding of Low-Alloy Steels

“…Welding was carried out at direct current of straight polarity. Electric signals of welding current and arc voltage were monitored at frequency of 50 kHz using the approach and instrument with high-speed analog-to-digital converters similar to those described in [9,10]. The accumulated data were processed to evaluate their statistical distribution as well as to estimated average duration of short-circuiting.…”