![]() ![]() ![]() These operators use a wire feeder with remote control so they do not need to return to the Miller Du-Op engine drive to adjust parameters, which they do when changing welding positions (e.g., flat, vertical up or overhead) or wire sizes (fig. The meters display wire feed speed or volts (one at a time) or they can be set to display amps or wire feed speed (one at a time). Both VS and RC feeders have digital meters, typically an option, make setting e xact parameters easier. Wire feed speed does not vary like it does with a voltage sensing system. When you set the controls for a wire feed speed of 250 inches per minute, that's what the system delivers. When welding procedures specify wire feed speed and voltage, a constant speed feeder may be your best choice. Further, voltage and amperage values remain constant unless manually adjusted, and both can be adjusted independently of each other. 3) at the feeder, a big benefit when working remotely (see fig. This arrangement requires an extra control cord between the feeder and the power source, but that allows operators to control both voltage and WFS (amperage, see fig. These wires are very voltage sensitive and generally require the fine-tuning capabilities of a CV machine.Ī constant speed wire feeder, such as the Miller SuitCase 8RC and 12RC, is used only with a constant voltage (CV) power source. Instead, experts recommend a CV power source for wire welding, especially for the nickel-alloy and other flux cored wires used for structural welds on buildings and bridges. It does not provide adequate assurance that the weld is being made with the proper voltage because operators must hunt for a voltage because the voltage fluxuates on a volt/amp curve from the CC power source (see Fig. Today, many engineering firms, construction companies and building codes no longer allow flux cored welding (FCAW) with a CC power source. In the past, contractors often adapted them for spray transfer MIG and flux cored welding by adding a voltage sensing wire feeder (short circuit MIG is very limited with this set up). This means your parameters can vary slightly.ĬC power sources, most notably older "DC generator" style engine drives, are designed for Stick/TIG welding. Also, because voltage varies directly with distance between the electrode and the work piece (arc length), the feeder attempts to regulate voltage variations (e.g., an unsteady hand) by controlling wire feed speed. This can present a headache when working remotely from the power source, such as up on scaffolding and when you need to adjust voltage. With a voltage sensing wire feeder and CV power source, voltage is set at the power source while wire feed speed (amperage) is set at the feeder. Be sure it is in the right position before welding. Note that these feeders typically have a CC/CV switch inside the case. Many operators feel the extra cord is just one more item to carry, lose or damage.Ī voltage sensing wire feeder can be paired with either a constant voltage (CV) or a constant current (CC) power source. This eliminates the need for a control cord between the power source and the feeder (see Fig. Voltage sensing feeders, such as Miller's SuitCase 8VS and X-TREME 12VS, operate on arc voltage. Suitcase wire feeders come in two categories: voltage sensing and constant speed. Voltage sensing or constant speed wire feeder? when empty (weight varies significantly, so check each model carefully). Suitcase feeders can weigh anywhere from 22 to 35 lbs. long, slim enough to allow easy movement through tight portholes, manholes or crawl spaces. diameter wires, you'll find suitcase feeders most often in construction, shipbuilding and mechanical contracting (especially maintenance/repair) where portability and protection are absolutely essential. Note the digital meters (fig 1).Īble to hold either an 8-in. Millers SuitCase X-TREME 12 VS feeder features a single voltage sensing lead for job site convenience. In fact, they feature the same casing technology the military uses to protect cameras and digital hardware. Miller's SuitCase® VS and RC series feeders (SuitCase® 8VS and X-TREME™ 12VS, 8RC and 12RC) offer unmatched performance. How effectively they accomplish this varies greatly between models. To that end, suitcase feeders feature crush-proof, flame retardant cases that protect internal components from dirt, moisture and contaminants. Portable or "suitcase-style" wire feeders are designed for operators in rugged conditions who need a feeder that will stand up to the elements and get in and out of tight spaces.
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