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A square incorporating a plumb bob to check if something is level, and for making horizontal markings. Positioning square, or clamping square, or assembly square An L-shaped square used in woodworking for checking an inside or outside angle when assembling workpieces, such as boxes. They are designed to be rigid enough to be clamped in place ...
The fireball could be seen from a distance of up to about 25–26 miles. There were no injuries. [93] November 24 – A 12-inch gas-gathering pipeline exploded and burned near Meta, Kentucky. There were no injuries reported. Acts of vandalism against the pipeline company had happened before. [94] [95]
Arc welding power supplies can deliver either direct (DC) or alternating (AC) current to the work, while consumable or non-consumable electrodes are used. The welding area is usually protected by some type of shielding gas (e.g. an inert gas), vapor, or slag. Arc welding processes may be manual, semi-automatic, or fully automated.
December 2 – 3 contractors were killed, and another injured, when a vacuum used to control flammable fumes accidentally reversed during welding at a pipeline facility near McCamey, Texas. [148] [149] December 9 – A bulldozer hit a 16-inch gas pipeline in North Attleboro, Massachusetts, forcing evacuations of a nearby shopping mall. An ...
Making a fillet weld with gas metal arc welding. Fillet welding refers to the process of joining two pieces of metal together when they are perpendicular or at an angle. . These welds are commonly referred to as tee joints, which are two pieces of metal perpendicular to each other, or lap joints, which are two pieces of metal that overlap and are welded at the
The same equipment can be used for oxyacetylene blowtorches and welding torches, by exchanging the part of the torch in front of the torch valves. For a basic oxy-acetylene rig, the cutting speed in light steel section will usually be nearly twice as fast as a petrol -driven cut-off grinder.
November 28 – In Portland, Tennessee, a Tennessee Gas Pipeline Company maintenance crew was welding an oil lubrication line at a compressor station when an explosion and flash fire occurred, injuring three workers. Apparently, gas from the compressor migrated into a crankcase and was ignited by a spark. The equipment was installed in 1950. [19]
Shielded metal arc welding (SMAW), also known as manual metal arc welding (MMA or MMAW), flux shielded arc welding [1] or informally as stick welding, is a manual arc welding process that uses a consumable electrode covered with a flux to lay the weld.
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