© COPYRIGHT 1998 THE ESAB GROUP, INC. LESSON II





Lesson 1
The Basics of Arc Welding
Lesson 2
Common Electric
Arc Welding Processes
Lesson 3
Covered Electrodes for Welding
Mild Steels
Lesson 4
Covered Electrodes for Welding Low Alloy Steels
Lesson 5
Welding Filler Metals for Stainless Steels
Lesson 6
Carbon & Low Alloy
Steel Filler Metals -
GMAW,GTAW,SAW
Lesson 7
Flux Cored Arc Electrodes Carbon Low Alloy Steels
Lesson 8
Hardsurfacing Electrodes
Lesson 9
Estimating & Comparing Weld Metal Costs
Lesson 10
Reliability of Welding Filler Metals
gas flows for a short interval before wire feeding starts; wire feeding starts; the arc is initiated and continues for a preset time (usually a few seconds).  The welding current and wire feeding stops, and the shielding gas flows for a short interval before it automatically stops.  The process is also useful for tacking welding  pieces in position prior to running the final weld bead. 2.4.3 EQUIPMENT AND OPERATION - The equipment used for gas metal arc welding is more complicated than that required for shielded metal arc welding.  Initial cost is relatively high, but the cost is rapidly amortized due to the savings in labor and overhead achieved by the rapid weld metal deposition. 2.4.3.1 The equipment necessary for gas metal arc welding is listed below: 1)   Power source 2)   Wire feeder 3)   Welding gun 4)   Shielding gas supply 5)   Solid electrode wire 6)   Protective equipment 2.4.3.2 The basic equipment necessary for semiautomatic gas metal arc welding is shown in Figure 12. FIGURE 12 FLOWMETER REGULATOR SHIELDING GAS POWER SOURCE GROUND CABLE WORK WELDING GUN WELD CABLE 115V CONTACTOR MAGNETIC VALVE TRIGGER CONTROL LEAD FEED ROLLS GAS HOSE WIRE FEEDER WIRE SPOOL + _ SCHEMATIC DIAGRAM SEMI-AUTOMATIC GMAW EQUIPMENT
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