tailieunhanh - WEO1S-GMA (MIG) PLUG WELD

Carsharing (or short-term auto use) provides a flexible alternative that meets diverse transportation needs across the globe, while reducing the negative impacts of private vehicle ownership. Although carsharing appeared in Europe between the 1940s and 1980s, it did not become popularized until the early 1990s. For nearly 20 years, there has been growing worldwide participation in carsharing. Today, carsharing operates in approximately 600 cities around the world, in 18 nations, and on four continents. Malaysia is operating a carsharing pilot, with a planned launch in late-2006. Another eight countries are exploring carsharing. This paper is based on 33 carsharing expert surveys collected internationally. Cost savings, convenient locations, and. | WE Menu Procedure Menu Uniform Procedures For Collision Repair WE01S-GMA MIG Plug Weld Copyright 1998 Inter-Industry Conference On Auto Collision Repair 1. Description This procedure describes methods for making and evaluating GMA MIG plug welds on all types of automotive steel. 2. Purpose The purpose of this procedure is to provide industry-accepted requirements for performing high-quality plug welds on steel. This procedure is intended for use by professionals who are qualified through training and experience. 3. Referenced Documents The following documents are considered part of this procedure by reference. Procedures PS01 Personnel Safety Other Information Equipment-specific information Vehicle-specific repair information Copyright 1999 Inter-Industry Conference On Auto Collision Repair WE01S-2 4. Equipment And Material Requirements Shielding Gas A shielding gas mixture of 75 argon and 25 CO2 is recommended for GMA MIG welding automotive sheet steel. The flow rate is normally set at 25-30 cfh or 3-4 psi at the regulator. A higher rate may be required in the presence of a strong breeze. Filler Wire Filler wire must be compatible with the base metal being joined. These filler wires are recommended AWS ER70S-6 AWS ER70S-7 These wire diameters are recommended mm .023 for 18-22 gauge steels mm .030 or mm .035 for 16 gauge and heavier including frames Flux-cored wire is not designed for steels thinner than 20 gauge and therefore is of limited use in collision repairs. Transfer Mode Short-circuit transfer is the preferred mode for GMA MIG welding automotive sheet steel. Polarity Reverse polarity electrode positive and base metal negative is recommended for most collision repair GMA MIG welding. Power Rating Collision repair GMA MIG welders operate on either 110- or 220-volt AC power. The thickness of the steel being welded determines how much amperage is needed. Generally one amp is needed for every .025 mm .001 of .