Record Details

Droplet detachment and plate fusion characteristics in pulsed current gas metal arc welding

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Droplet detachment and plate fusion characteristics in pulsed current gas metal arc welding
 
Creator RAJASEKARAN, S
KULKARNI, SD
MALLYA, UD
CHATURVEDI, RC
 
Subject pulsed current gmaw
droplet detachment
metal transfer
plate fusion
pulse parameters
arc stability
parametric zones
weld characteristics
arc length
weld quality
 
Description Molten metal droplet detachment and plate fusion characteristics, which have an important bearing on the weld quality, were influenced by the parameters of pulsed current, viz. peak current (I-P), peak duration (T-P), background current (I-B) and background duration (T-B). The complex interdependence of the above parameters of pulsed current makes it difficult to select the most suitable combination of parameters for welding (Refs. 1-3). To resolve this problem, a first estimate of the pulse parametric zone based on burnoff, droplet detachment and are stability criteria was obtained. It has been Further restricted taking into account the short circuit and burnback characteristics. Within this narrowed zone, the suitable combination of the pulsed current parameters has been recommended on the basis of a combined criteria, viz. uniformity in are length, uniformity in droplet detachment and weld bead surface quality. This is done to obtain good quality welds. These studies have been carried out for a fixed pulse cycle time and one droplet detachment per pulse conditions. Further studies have been carried out for different types of droplet detachments, namely background detachment, one droplet detachment per peak, two droplets detachment per peak and three droplets detachment per peak by varying pulse cycle time. The suitable type of droplet detachment has been selected on the basis of uniformity in are length, uniformity in droplet detachment and uniformity in weld bead surface undulation. The effect of types of droplet detachment on weld bead geometry has been studied. The peak energy, are noise level, reinforcement height and heat input were found to be low for background detachments. Also with background detachments, uniformity in are length and weld penetration were found to be high.
 
Publisher AMER WELDING SOC
 
Date 2011-07-17T09:32:47Z
2011-12-26T12:50:14Z
2011-12-27T05:36:22Z
2011-07-17T09:32:47Z
2011-12-26T12:50:14Z
2011-12-27T05:36:22Z
1998
 
Type Article
 
Identifier WELDING JOURNAL, 77(6), 254S-269S
0043-2296
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4686
http://hdl.handle.net/10054/4686
 
Language en