Stationary oxyacetylene welding equipment is installed where welding operations are conducted in a fixed location. Oxygen and acetylene are provided in the welding area as outlined below. Oxygen. Oxygen is obtained from a number of cylinders manifolded and equipped with a master regulator. The regulator and manifold control the pressure and the flow together (fig. 5-1). The oxygen is … Read more
** POTENTIAL HAZARDS** When any of the welding processes are used, the molten puddle should be shielded from the air in order to obtain a high-quality weld deposit. In shielded metal arc welding, shielding from the air is accomplished by gases produced by the disintegration of the coating in the arc. With gas shielded arc … Read more
MIG Welding Equipment, Gas Metal Arc Welding (GMAW). GMAW is most commonly referred to as “MIG” welding, and the following text will use “MIG” or “MIG welding” when referring to GMAW. MIG welding is a process in which a consumable, bare wire electrode is fed into a weld at a controlled rate of speed, while a blanket … Read more
*Zinc ***is a medium low strength metal having a very low melting point. It is easy to machine, but coarse-grain zinc should be heated to approximately 180°F (82°C) to avoid the cleavage of crystals. It can be soldered or welded, if it is properly cleaned and the heat input closely controlled. Uses. Galvanizing metal is the … Read more
(a) General. These are usually made with alloys of aluminum, lead, magnesium, or tin. Except for those made of lead and tin, they are generally light in weight and white in color. (b) Appearance. The surface is much smoother than that produced by castings made in sand.( c) Fracture test. The fractured surface is white and somewhat granular. … Read more
(a) General. Tin is a very soft, malleable, somewhat ductile, corrosion-resistant metal having low tensile strength and high crystalline structure. It is used in coating metals to prevent corrosion. (b) Uses. The major application of tin is in coating steel. It serves as the best container for preserving perishable focal. Tin, in the form of foil, is … Read more
Steel a form of iron, contains less carbon than cast iron, but considerably more than wrought iron. The carbon content is from 0.03 to 1.7 percent. Uses Steel is used to make nails, rivets, gears, structural steel, roles, desks, hoods, fenders, chisels, hammers, etc. Capabilities Steel can be machined, welded, and forged, all to varying degrees, depending on the … Read more
Nickel is a hard, malleable, ductile metal. As an alloy, it will increase ductility, have no effect on grain size, lower the critical point for heat treatment, aids fatigue strength, and increase impact values in low-temperature operations. Both nickel and nickel alloys are machinable and are readily welded by gas and arc methods. Uses. Nickel is … Read more
Pure molybdenum has high tensile strength and is very resistant to heat. It is principally used as an alloying agent in steel to increase strength, hardenability, and resistance to heat. Uses. Molybdenum is used mainly as an alloy. Heating elements, switches, contacts, thermocouples, welding electrodes, and cathode-ray tubes are made of molybdenum. Molybdenum does not occur naturally as … Read more
Pure manganese has a relatively high tensile strength but is very brittle. It is used as an alloying agent in steel to deoxidize and desulfurize the metal. In metals other than steel, percentages of 1 to 15 percent will increase the toughness and the hardenability of the metal involved. Uses. It is used mainly as an alloying agent in … Read more