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The gun itself has a motor that rotates the contact tip. The controlled rotation occurs very quickly; typical settings are between 2,000 and 4,000 RPM. The operator can set the spin diameter and speed.
As the spin diameter increases, the bead width increases. “You can tailor these variables to the specific weld joint,” Funderburk said. “So, for example, if you want to weld an overlay or hardface using corrosion-resistant material, you want a fairly wide weld bead. When you spread out the arc energy, it minimizes dilution. For a narrow groove, you want a smaller spin diameter.”
The system can rotate the wire clockwise or counterclockwise, and which to choose usually depends on the weld direction to ensure the arc energy focuses on the leading edge of the weld pool. If you’re welding left to right, you typically rotate the wire clockwise; if you’re welding right to left, you rotate the wire counterclockwise.
“For fillet welds, you can take advantage of small and large spin diameters, where you’d have a dual-gun inline [mechanized] setup,” Funderburk said. “The first gun to have a small spin diameter to put a lot of energy in the root [of the weld], while the second gun would have a wider spin diameter to complete the weld with good penetration into the base metal.” Funderburk added that a dual-gun setup isn’t required for fillet welds, of course, but it’s an option.
When looking at the system in operation, a welder might see this as a function that automates the weaving action many perform to fill a joint. But according to sources, the wire rotation really doesn’t relate to weaving at all, mainly because of the speed of the rotation.
Thousands of rotations can occur every minute. Looking at high-speed video you can see droplets deposit at different points around the circumference of the rotation. All of this occurs in a fraction of a second, transferring the arc energy in an even manner and creating a uniform heat-affected zone.
壓鑄展-鑄造展-2016第十七屆廣州國際壓鑄、鑄造及工業(yè)爐展覽會-中國最受關注的壓鑄鑄造展會-巨浪展覽
Die-casting-The
17th Guanzhou Die-casting,Foundry&Industry Furnace Exhibition
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