Everyone in the welding industry knows that heat input can be an important topic. Along with temperature distribution, it is one of the major factors in determining weld penetration, post-weld distortion, and the development of grain structures. Anything that provides better control over these variables has the potential to achieve huge benefits in a wide variety of welding applications. It just so happens, that controlling these variables is one of the most important aspects of SpinArc technology!
A conventional welding torch produces a temperature distribution like the one shown in Figure 1. The welding arc is concentrated at the center of the weld puddle and creates a point of intense heat. This intense heat drops off rather sharply at a short distance from the puddle, and then more gradually out to the edges of the affected area. Such an extreme temperature gradient can have a number of negative effects including an increase in non-uniform expansion and contraction in the part, resulting in higher levels of distortion.
Starting to Spin
So what is SpinArc, and how does it improve the situation? In case you’re not familiar with it, SpinArc is a welding technology that uses high-speed contact tip rotation to achieve a variety of benefits in a wide range of welding applications. Its uses include reduced bevel (narrow groove) welds, fast fillet welds, cladding/hard-facing applications, and more.
As noted previously, one of the reasons for the rather extreme heat pattern in Figure 1 is that the arc is concentrated at the center of the weld puddle. By rotating the contact tip and moving the arc around a larger weld puddle, this heat can be “spread out” to create a more gradual temperature distribution. This effect can be seen quite clearly in the high speed arc footage below. Note how the melted droplets are distributed around the perimeter of the weld instead of driving into a single point at the center of the puddle.
So SpinArc can make a difference, but how much of a difference? And how do we control it? SpinArc offers two parameters that can be adjusted to alter the heat input and distribution of the weld. These two parameter are the diameter and speed (RPM) of rotation. As either of these parameters is increased the heat is distributed further and more evenly from the weld puddle and the overall heat input is decreased (see Figures 2 & 3). By combining these two variables, SpinArc is able to offer a truly massive range of control over the heat in your weld.
Of course, all of this aside, heat isn’t exclusively a bad thing in the world of welding. You need heat to get the job done, it’s an important part of the welding process. What SpinArc offers you is the ability to control that heat and tailor it to your specific applications!
If you’re interested in learning more about how SpinArc can improve your welding applications then leave a comment, or send us an email at firstname.lastname@example.org, or give us a call at (832) 585-1244.