Kemppi MasterTig LT 250 Operating Manual

Also see for MasterTig LT 250: Quick guide

Contents

EN3.2 Shielding gasIn TIG welding, shielding gas is used to prevent atmospheric contamination of the molten weldpool. Normally, the shielding gas is argon (Ar), and the gas flow rate is approximately 8 – 12 litresper minute, but this can vary according to the welding current used and the size of gas nozzle.The machine is delivered with a 4.5 m long shielding gas hose. Connect the supplied female snapconnector of the shielding gas hose to the machine’s male hose connector, max. connectionpressure 500 kPa (5 bar). Connect the free end of the shielding gas hose to the gas bottle, via asuitable and approved single stage regulator valve, where outlet flow rates can be adjusted.NOTE! Never attempt to connect directly to a compressed gas cylinder. Always use an approved andtested regulator and flow meter.Connecting the gas hose to a typical welding regulator control valve1. Connect the supplied shielding gas hose to machine and via a suitable coupling to the gasregulator control valve outlet and tighten the connector.2. Open the valve of the bottle.3. Measure the flow.4. Adjust the flow by the knob (8 – 12 l/min).NOTE! Use a suitable shielding gas for the welding application. Always secure the gas cylinder in anupright position with either a specially made wall rack or cylinder trolley. Always close the cylinder valveafter welding.MasterTig LT 2508