what is the main principle of gas welding?
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Process features Oxyacetylene welding, commonly referred to as gas welding, is a process which relies on combustion of oxygen and acetylene. When mixed together in correct proportions within a hand-held torch or blowpipe, a relatively hot flame is produced with a temperature of about 3,200 deg. C.
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Pure argon can be used for both GMAW and GTAW welding and is the most popular of the shielding gases used for aluminum. The helium content gases are usually more expensive. Helium has a lower density than argon and higher flow rates are used when welding with helium.
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GMAW will provide a "low-hydrogen" weld deposit. The electrode or process itself is not low-hydrogen. ... 2 (b) that GMAW with clean solid wires is considered to be a H1, extra low hydrogen level process. Also, in table 3.2 on prequalified preheat and interpass temperature, GMAW is grouped with low hydrogen SMAW.
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2F is a fillet weld position, in which the welding is done on the upper side of the surfaces that is approximately horizontal that lies against a surface that is approximately vertical. In this position, the torch is usually held at a 45-degree angle.
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The MAPP/oxygen flame is not entirely appropriate for welding steel, because of the high concentration of hydrogen in the flame – higher than acetylene, but lower than any of the other petroleum fuel gases. The hydrogen infuses into the molten steel and renders the welds brittle.
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['A gas consists of molecules in constant random motion.', 'Gas molecules influence each other only by collision; they exert no other forces on each other.', 'All collisions between gas molecules are perfectly elastic; all kinetic energy is conserved.']
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The basic conditions of welding quality to achieve products of such high quality includes the following: No cracks or holes found in the bead. The bead has uniform waves, width and height. The finished product satisfies the design dimensions and has almost no distortion.
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['Clean the workpiece.', 'Clamp the work close to the weld.', 'Insert the electrode into the insulated holder holder. Set amperage at levels recommended by the electrode manufacturer.', 'Determine the best arc length. ... ', 'Have a chipping hammer available to remove any slag and before doing a 2nd pass with the weld.']
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['Blueprint Reading.', 'MIG Welding.', 'Fabricating.', 'Steel Manufacturing.', 'Grinding.', 'TIG Welding.', 'Instructing.', 'Torching.']
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Product Description A G size mixed argon welding gas cylinder (Argon 5/2) consisting of 93% Argon, 5% CO2 and 2% O2 which contains 8.7 cubic metres of gas (8700 Litres) and is ideal for Mig Welding of mild steel. The cylinder dimensions are 163cm high x 27cm diameter, the cylinder weight is 80Kg.
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Unlike a spot weld that uses a single point electrode, a seam weld uses a rotating wheel electrode that produces a rolling resistance weld. This process is most often used to join two sheets of metal. MIG and TIG welders can be used to do seam welding.
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Key Concepts The kinetic-molecular theory of gases assumes that ideal gas molecules (1) are constantly moving; (2) have negligible volume; (3) have negligible intermolecular forces; (4) undergo perfectly elastic collisions; and (5) have an average kinetic energy proportional to the ideal gas's absolute temperature.
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A welding electrode is made up of two parts: the actual metal, and the flux coating. The metal can vary from mild-steel, cast iron, stainless steel, high-tensile steel, copper, bronze, brass, or aluminum.
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For many welders, the best multi-process welding tool is one that will perform MIG and TIG welding, along with stick welding. ... Many of the new multi-process welders are in the 200- to 300-amp category. That keeps them reasonably affordable, but also limits some of the welding projects that you can complete.
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Flat Position (1G or 1F) This type of welding is performed from the upper side of the joint. The face of the weld is approximately horizontal. Flat welding is the preferred term; however, the same position is sometimes called downhand.
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A welding or more accurate a brazing torch has a tip with one hole. There are two valves controlling the amount of oxygen and acetylene going to it. A cutting torch has a series of small holes around a larger hole . The small holes receive a mixture of oxygen and acetylene to heat the metal being cut.
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The normal gas for TIG welding is argon (Ar). Helium (He) can be added to increase penetration and fluidity of the weld pool. Argon or argon/helium mixtures can be used for welding all grades. In some cases, nitrogen (N2) and/or hydrogen (H2) can be added to achieve special properties.