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Electric Welding Types And Thier Operations

3261 words - 13 pages

Shielded Metal Arc Welding (SMAW)OperationOne reason for the wide acceptance of the SMAW process is the simplicity of the operation of the machine and the necessary equipment. Welding is performed with the heat of an electric arc that is maintained between the end of a coated metal electrode and the work piece (See Figure 1). The heat produced by the arc melts the base metal, the electrode core rod, and the coating. As the molten metal droplets are transferred across the arc and into the molten weld puddle, they are shielded from the atmosphere by the gases produced from the decomposition of the flux coating. The molten slag floats to the top of the weld puddle where it protects the weld metal from the atmosphere during solidification.ApplicationThe Shielded Metal Arc Welding process can be utilised for the joining of steels, stainless steels, cast irons, and also certain nonferrous alloys. It is rarely used for aluminum and its alloys, copper alloys, or titanium. More commonly used for out of position work and work that may occur in windy conditions such as the outdoors. The gaseous shroud created by the flux in order to protect the molten pool of metal is not as easily blown away in the wind as occurs in the GMAW process.EquipmentThe equipment for SMAW consists of the following items. (See Figure 2)1. Power source (15 Amps should be used rather than domestic 12A power sockets)2. Electrode holder3. Ground clamp4. Welding cables5. Accessory equipment including chipping hammer and wire brush)6. Protective equipment such as helmet (see Figure 3)AdvantagesThe main advantage of SMAW is that the initial investment in equipment is low - with Stick welding you receive more amps per dollar compared to MIG welding.Other great advantages of SMAW include the ease of out of position work and work that may occur in windy conditions such as the outdoors. The gaseous shroud created by the flux in order to protect the molten pool of metal is not as easily blown away in the wind as occurs in the GMAW process.DisadvantagesA great disadvantage of SMAW is the simple fact that electrodes must be periodically changed. With the GMAW system, for example, there is no time wasted in the changing of electrodes as there is a constant feed of electrode wire.The SMAW process cannot be used to weld thin material as the amperage required is too high for them to cope with.Slag must be cleaned off the weld which is a messy and time-consuming job.The operating cost of Stick welding is in actual fact, higher than MIG welding, because Stick welding doesn't have as good of a deposition rate. For example, 50 lbs. of Stick electrodes yield approximately 30 lbs. of deposition (as compared to 50 lbs. of MIG welding wire yielding 49 lbs. of deposition).Gas Metal Arc Welding (GMAW)OperationGMAW is an arc welding process that uses the heat of an electric arc established between a consumable metal electrode and the work to be welded. The electrode is a bare metal wire that is transferred...

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