Presentation on theme: "SOURCEwww.agednet.com. Heat for arc welding is obtained by electricity. Electric current flows from a transformer connected to lines from a power plant."— Presentation transcript:
Heat for arc welding is obtained by electricity. Electric current flows from a transformer connected to lines from a power plant. Other sources for electricity for welding are electric motors and gas engines driving special generators. A machine that increases current for welding is known as an arc welder. An arc is the discharge of electricity through an air space. This discharge requires a high current of electricity. Welders are transformers that change ordinary current to a current powerful enough to create heat to melt steel.
When several people are present, arc welding should be done in a booth or behind a fireproof screen.
When preparing to begin welding, ask everyone to put on eye protection or turn around with their backs to the person welding. An unprotected person standing beside someone who is welding can burn the side of their eye, even if he or she is not looking at the welding. It is important to use a shield at all times.
Make sure that the helmet and lenses are in good condition. Even a tiny pinhole in the lens can cause eye damage. The helmet should protect the entire face and neck. Helmets contain 2 or 3 lenses to protect your eyes and face. One lens is clear glass and there may be plastic lenses in front of and behind the glass. The plastic protects the glass from breaking and is much cheaper to replace if it gets spattered with slag.
Be sure to use the proper lenses. Lenses designed for gas welding are not sufficient for arc welding.
Do not strike an arc until your helmet is in place. Check to see that all observers are using proper protective equipment. Never look at the arc with the naked eye. Even very short exposure to the ultraviolet light of a welder can cause eye damage.
Wear gauntlet-type leather gloves while you are using a welder. Make sure shirt sleeves are neatly tucked inside the gauntlets.
Wear suitable clothing to protect all parts of the body from the rays of the arc and the spatter of hot metal. A leather coat or leather vest will protect you from sparks.
There should be no frayed threads on shirt, pants or any other clothing, since frayed clothing can easily catch on fire. Keep shop clothes clean. Oil-soaked clothes are easily ignited.
Wear pants without cuffs. Sparks may fall into the cuffs and burn the pants. You may not even be aware of the sparks until the pants are on fire. Shoes should be leather, not canvas. Canvas can too easily catch on fire.
SAFETY ISSUES If a safety violation occurs: IMMEDIATELY – Student must correct it IMMEDIATELY – If student fails to comply, you will not be allowed to weld and be in the welding classroom JUST DO IT – Do not ask why you have to be safe, JUST DO IT PHS Ag Dept. disciplinary procedures will start Attitude issues while in the lab are not tolerated, your unsafe demeanor is dangerous and you will not be allowed in or to continue