Évaluations - 5, GPA: 3.4
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Facilité d'utilisation
2. Use compressed air to blow all dust and lint from the ventilation openings. 3. Clean the wire groove on the drive roll. Remove wire from the feed mechanism, remove screws from the drive roll housing. Use a small wire brush to clean the drive roll. Replace if worn or damaged. Consumable and Wear Parts The following parts require routine maintenance: • Wire feed drive roller • Gun liner - replace if worn • Nozzle/contact tips • Wire - This welder will accept either 4” or 8” diameter spools. Flux-cored welding wire is susceptible to moisture and oxidizes over time, so it is important to select a spool size that will be used within approximately 6 months. Use AWS type AWS E71T-GS or E71T-11, .030" (.8mm) or .035" (.9mm) diameter. Call (800) 746-5641 for replacement parts General This line of welding machines utilizes the Flux Cored Arc Welding (Gasless) process. The weld must be protected (shielded) from contaminates in the air while it is molten. The gasless process uses a tubular wire with a flux material inside. The flux creates a shielding gas when melted. When current is produced by a transformer (welding machine) and flows through the circuit to the weld wire, an arc is formed between the end of the weld wire and the work piece. This arc melts the wire and the work piece. The melted metal of the weld wire flows into the molten crater and forms a bond with the work piece as shown (Figure 7). Slag Weld Wire Flux Work Piece Contact Tip Crater Nozzle Figure 7 - Weld Components Arc Welding Basics Five basic techniques affect weld quality. These are: wire selection, heat setting, weld angle, wire speed, and travel speed. An understanding of these techniques is necessary for effective welds. HEAT SETTING The correct heat involves the adjustment of the welding machine to the required setting. The heat setting used depends on the thickness of the work piece. Consult specifications listed on the welder. It is suggested that the welder practice with scrap metal to adjust settings, and compare welds with Figure 12. 5 Wire Feed Arc Welder Welding Guidelines (Continued) WIRE TYPE AND SIZE The correct choice of wire type involves a variety of factors, such as welding position, work piece material type, thickness, and condition of surface to be welded. The American Welding Society, AWS, has set up certain requirements for each type of wire. The AWS classification for self-shielding wire (Gasless process) is a multi digit number preceded by the letter E. FLUX-CORED WIRE E -70T -GS Weld strength, times 10,000 pounds per square inch Welding positions (0 for flat or horizontal, 1 for any position) Tubular flux core wire Flux type AWS E71T-GS or E71T-11 is recommended for this welder. WELD ANGLE Weld angle is the angle at which the nozzle is held during the welding process. Weld angle involves two positions - travel angle and work angle. 5. - 45. WORK ANGLE 5. - 45. TRAVEL ANGLE Figure 8 - Weld Angle Travel angle is the angle in the line of welding and may vary from 5. to 45. from the vertical, depending on welding conditions. Work angle is the angle from horizontal, measured at right angles to the line of welding. For most applications, a 45. travel angle and 45. work angle is sufficient. For specific applications, consult an arc welding handbook. WIRE SPEED The wire speed is controlled by the knob on the front panel. The speed needs to be “tuned” to the rate at which the wire is being melted in the arc. Too slow of speed will cause sputtering and the wire will burn up into the contact tip. Too fast a speed will also cause a sputtering sound and the wire will push into the plate before melting. TRAVEL SPEED The travel speed is the rate at which the torch is moved across the weld area. Factors such as diameter and type of weld wire, amperage, position, and work piece material thickness all effect the speed of travel necessary for completing a good weld (See Fig. 12). When the speed is too fast, the bead is narrow and bead ripples are pointed as shown. When the speed is too slow, the weld metal piles up and the bead is high and wide. SLAG REMOVAL (FLUX-CORED WIRE ONLY) Wear ANSI ! WARNING approved safety glasses (ANSI Standard Z87.1) and protective clothing when removing slag. Hot, flying debris can cause personal injury to anyone in the area. After completing the weld, wait for the welded sections to cool. A protective coating called slag now covers the weld bead which prevents contaminants in the air from reacting with the molten metal. Once the weld cools to the point that it is no longer glowing red, the slag can be removed. Removal is done with a chipping hammer. Lightly tap the slag with the hammer and break it loose from the weld bead. The final clean-up is done with a wire brush. When making multiple weld passes, remove the slag before each pass. WELDING POSITIONS Four basic welding positions can be used; flat, horizontal, vertical, and overhead. Welding in the flat position is easier than any of the...