• Cerjak, Horst-Hannes
• Klagges, Wilhelm
• Vallant, Rudolf
• Posch, Gerhard

Abstract

In the last years new types of welding electrodes are strongly evolving on the market: Flux-<br/>cored wires (FCW) and Metal-cored Wires (MCW) as replacement for the solid wire in the<br/>standard gas metal arc welding (GMAW) process. These new types are produced by filling in<br/>various metal and/or mineral powders into a tube or a rolled strip before drawing to diameters<br/>equivalent to those of solid wires used for GMAW. Using this technique the benefits of slag<br/>systems process and easy variation of alloying concepts known from the shielded metal arc<br/>welding (SMAW) process can be applied to the very economic GMAW welding process with<br/>additional advantages in the welding behaviour.<br/>This paper explains in short the production technology and possibilities of nickel base cored<br/>wires and deals with the influence of different Nb/C-ratios on the hot cracking susceptibility<br/>and mechanical properties especially in nickel base 70/20 and 70/15 weld metals. Using the<br/>PVR-hot cracking test facility and tensile testing an optimum Nb/C-ratio could be found to<br/>minimize the hot cracking susceptibility at requested mechanical properties.<br/>At least the achieved results of different nickel-base cored wire weld metals will be set into<br/>relation to weld metals achieved with the SMAW and the solid wire GMAW process.

Topics

• mineral
• nickel
• crack
• susceptibility
• wire
• drawing
• niobium