Experimental examination of welding nozzle jet flow at cold flow conditions

Abstract

A fundamental study of welding nozzle flow under cold flow conditions is presented. The aim is to examine the shielding gas flow characteristics for several gas metal arc welding (GMAW) flow conditions. Experimental investigations are used to predict the flow behaviour of the gas shielding the weld pool. Results are presented for generic GMAW nozzle configurations at typical welding situations under cold flow. Flow visualisation and particle image velocimetry (PIV) gas velocity measurements reveal the various flow characteristics that are crucial to understanding of weld pool protection by the shielding gas. Results may be used to assist in understanding shield gas delivery and the effect of flow and geometry variables on shield gas coverage.

Keywords:

• NOZZLE
• SHIELD GAS
• GMA WELDING
• JET FLOW