A sharpened 1mm tungsten electrode is used for this application. The welds pictured above were performed in Nano Mode at 3ws energy using a sloped weld agitation (for more penetration). The energy level can be increased for greater spot sizes but at higher energy levels the oil inside the cup will wick up and cause blackening around the weld site. We placed a weld on each side of the joint but welds could be continuous along the joint if desired.
The spring is attached to the rod in Nano Mode at 4.5ws energy using sloped weld agitation.
The Orion Pulse 150i is a versatile machine with an easy to use operator interface and is able to quickly and easily perform these welds.