What Is A Angle Grinder?

An angle grinder, also known as a side or disc grinder, is a handheld power tool used for cutting, grinding and polishing.

Angle grinders can be powered by an electric motor, petrol engine or compressed air. The motor drives a geared head at a right-angle on which is mounted an abrasive disc or a thinner cut-off disc, either of which can be replaced when worn. Angle grinders typically have an adjustable guard and a side-handle for two-handed operation. Certain angle grinders, depending on their speed range, can be used as a sander, employing a sanding disc with a backing pad or disc. The backing system is typically made of hard plastic, phenolic resin, or medium-hard rubber depending on the amount of flexibility desired.

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What Is Oxy-Fuel Cutting?

In oxy-fuel cutting, a cutting torch is used to heat metal to kindling temperature. A stream of oxygen is then trained on the metal, and metal burns in that oxygen and then flows out of the cut (kerf) as an oxide slag.

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What Is Oxy-Fuel Welding?

Oxy-fuel welding(commonly called oxyacetylene welding, oxy welding, or gas welding in the U.S.) and oxy-fuel cutting are processes that use fuel gases and oxygen to weld and cut metals, respectively. French engineers Edmond Fouché and Charles Picard became the first to develop oxygen-acetylene welding in 1903.[1] Pure oxygen, instead of air (20% oxygen/80% nitrogen), is used to increase the flame temperature to allow localized melting of the workpiece material (e.g. steel) in a room environment. A common propane/air flame burns at about 3,630 °F (2,000 °C), a propane/oxygen flame burns at about 4,530 °F (2,500 °C), and an acetylene/oxygen flame burns at about 6,330 °F (3,500 °C

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What Is Expanded Metal?

Expanded metal is a form of metal stock made by shearing a metal plate in a press, so that the metal stretches, leaving diamond-shaped voids surrounded by interlinked bars of the metal. The most common method of manufacture is to simultaneously slit and stretch the material with one motion. It is often shortened to exmet, which also refers to a commercial firm by the same name that manufactures expanded metal. Also referred to as perforated metal, it is a large part of the metal industry and plays a key roll in fabrication.

Expanded metal is used in grates and in outdoor furniture (e.g. benches) or fencing. It is often used for guarding to prevent contact with hot surfaces or machinery.

Expanded metal is often used for architectural details and finds use in security applications such as in the walls of a Sensitive Compartmented Information Facility because, in heavier grades, it is difficult to breach without heavy cutting equipment or explosives.

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How To Defeat A Thief?

Nowadays, theives are everywhere. You want to keep your belongings safe from them. Here are some tips for riding mass transit:
Secure Your Backpack/Purse.
Keep Your Wallet, Up Front.
Carry your handbag,Up Front.
Stay With Others...During Off Peak Hours
a. Use Designated Waiting Areas
b. Ride In The Conductor's Car
Avoid Being "Bumped".
Be Alert For "Staged Distractions".
Keep Jewelry Hidden.
Protect Your Personal Space.
These tips will assist you in defeating a thief.
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What Are Diamond Plate(s)?

Diamond plate, also known as checker plate, tread plate and Durbar floor plate, is a type of lightweight metal stock with a regular pattern of raised diamonds or lines on one side, with the reverse side being featureless. Diamond plate is usually steel, stainless steel or aluminum. Steel types are normally made by hot rolling, although modern manufacturers also make a raised and pressed diamond design.

Used on stairs and catwalks in industrial settings, the added texture reduces the risk of slipping. For this reason diamond plate is frequently used on the interior of ambulances and on the footplates of firetrucks. Diamond plate can also be used decoratively, particularly highly polished aluminum variants.

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Reasons Why Welders Wear Welding Helmets

Welding helmets are headgear used when performing certain types of welding to protect the eyes, face and neck from flash burn, ultraviolet light, sparks, infrared light, and heat. Most commonly used with arc welding processes such as shielded metal arc welding, gas tungsten arc welding, and gas metal arc welding. Welding helmets are necessary to prevent arc eye, a painful condition where the cornea is inflamed. Welding helmets can also prevent retina burns, which can lead to a loss of vision. Both conditions are caused by unprotected exposure to the highly-concentrated ultraviolet and infrared rays emitted by the welding arc. Ultraviolet emissions from the welding arc can also damage uncovered skin, causing a sunburn-like condition in a relatively short period of welding. The modern welding helmet used today, was first introduced in 1937 by Willson Products. All welding helmets include a window covered with a filter called a lens shade, through which the welder can see to work. In most helmets, the window may be made of tinted glass, tinted plastic, or perhaps a variable-density filter made from a pair of polarized lenses. Recently helmets have been developed that use an electronic LCD shutter that darkens automatically when exposed to the bright welding arc so the welder can see to work under normal ambient light while wearing the helmet. With the development of electronic auto-darkening helmets, the welder no longer has to get ready to weld and then nod their head to lower the helmet over their face. However, these electronic auto-darkening helmets are significantly more expensive.