The use of additional filler wire to solve the tandem GMAW issues

I O Polevoy,A M Fiveyskii

doi:10.1088/1757-899x/966/1/012013

Abstract

A review of the studies showed that the existing technologies for tandem gas metal arc welding (GMAW) of butt welds have a number of problems that do not allow to increase productivity while maintaining low heat inputto base material and stability of the welding process. The possible solution of this problem by feeding of additional filler wire (AFW) in between the welding electrodes is researched in this study. Influence of addition of AFW into the arc and into the weld pool for single-arc GMAW on deposition rate and geometric properties of the welds are researched and the main problems of these methods are showed in the study. The effect of addition of AFW on the temperature of weld pool and heat input to base metal and solidification rate of the weld pool are showed in the study too. The main disadvantages of using pulsed welding modes for providing the stability of tandem welding process are described and the addition of AFW in between the welding electrodes for stabilization of trailing arc is justified. It is concluded that the further complex studies of effects of AFW on tandem GMAW are needed.

Highlights

Recently an increase in the productivity of welding processes only by increasing the specific heat input became non optimal, since this leads to deterioration in the weld metal formation and deterioration in the mechanical properties of the heat affected zone (HAZ)
One of the most common methods of multi-wire welding is tandem gas metal arc welding (GMAW), which is actively used in the manufacture of ship panels, mining equipment and in bridge building and allows to achieve high process performance and reduce heat input to the base metal, on the one hand, due to the increased deposition rate, and on the other, due to an increase in welding speed, in some cases more than doubled
A distinctive feature of tandem welding is the use of welding wires isolated from each other, which are fed through separate feeding mechanisms

Summary

Introduction

An increase in the productivity of welding processes only by increasing the specific heat input became non optimal, since this leads to deterioration in the weld metal formation and deterioration in the mechanical properties of the heat affected zone (HAZ). One of the most common methods of multi-wire welding is tandem gas metal arc welding (GMAW), which is actively used in the manufacture of ship panels, mining equipment and in bridge building and allows to achieve high process performance and reduce heat input to the base metal, on the one hand, due to the increased deposition rate, and on the other, due to an increase in welding speed, in some cases more than doubled.

Published under licence by IOP Publishing Ltd

Welding Direction

AFW Feeding

Findings

GMAW Torches