Lincoln Electric IM679-A manual Operation

B-3 OPERATION B-3

•The Arc Control regulates the relative Slope of the process. Slope dynamically controls the force the arc has to penetrate an open root. At the minimum setting, Arc Control is very soft and is similar to the Stick Soft mode. At the maximum setting, the slope is reduced, the OCV is reduced, and the operator has full control off the arc force required to pene- trate an open root joint. For vertical down, open root pipe welding applications, the recommended setting is between 8 and 10.

•During welding, a boost circuit increases the avail- able voltage to minimize pop outs. The boost circuit is independent of the OCV and only operates when an arc is lit.

TIG GTAW: The TIG mode features continuous con- trol from 5 to 425 amps. The TIG mode can be run in either the TIG touch start or high frequency (optional equipment required) assisted start mode.

•The Hot Start control selects the starting mode desired. A setting of less than 5, the TIG lift start mode is selected. The OCV is controlled below 10v and the short circuit "TIG touch" current is main- tained at 25 amps independent of the preset cur- rent.

When the tungsten is lifted, an arc is initiated and the output is regulated at the preset value. Hot start settings between 0 and 5 regulate the arc initiation current. A setting of 5 results in the most positive arc initiation. A setting of 0 reduces hot start.

•Hot Start settings between 5 and 10, select high frequency assisted starting TIG mode. In this range, the OCV of the machine is controlled between 50 and 70 volts. If using the Lincoln K930- 1 TIG Module, set the Hot start to 10 for maximum OCV.

•The Arc Control is not used in the TIG mode.

CV-WIRE:The CV-WIRE mode features continuous control from 10 to 40 volts. The mode was intended for most GMAW, FCAW, and MCAW applications.

•The Hot Start control is not used in the CV-WIRE mode.

•The Arc Control regulates pinch effect. At the mini- mum setting (-10), minimizes pinch and results in a soft arc. Low pinch settings are preferable for weld- ing with gas mixes containing mostly inert gases. At the maximum setting (+10), maximizes pinch effect and results in a crisp arc. High pinch settings are preferable for welding FCAW and GMAW with CO2.

CV-FLUX CORED: The CV-FLUX CORED mode fea- tures continuous control from 10 to 45 volts. This mode was designed for self-shielded flux cored wires that require tight voltage control.

•The Hot Start control is not used in the CV-FLUX CORED mode.

•The Arc Control regulates pinch effect. At the mini- mum setting (-10), minimizes pinch and results in a soft arc. At the maximum setting (+10), maximizes pinch effect and results in a crisp arc. Most self- shielded wires work well at an Arc Control setting of 5.

V350-PRO