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Welding is an efficient and easy way to cut down on maintenance or repair costs associated with metal equipment around the house or farm. wear an approved welding helmet fitted with a proper shade of filter lenses to protect your face and eyes from arc rays and sparks when welding or watching ( see ansi z49. the intense heat produced by the arc quickly melts a por- tion of the base metal, resulting in the formation of a weld. techniques arc rays from the welding process arc welding techniques pdf produce intense visible and pdf invisible ( ultraviolet and infrared) rays that can burn eyes and skin.
arc welding techniques pdf the operator must know how to control the arc, and this requires a knowledge of the welding circuit and the equipment that provides the electric current used in the arc. the arc- welding circuit the operators knowledge of arc welding must go beyond the arc itself. common arc welding processes are manual metal or shielded metal arc welding ( mma or sma), metal inert gas arc ( mig), tungsten inert gas ( tig), submerged arc ( sa), plasma arc ( pa), carbon arc ( ca) selding etc. power source electrode holder power terminals arc workpiece power cable electrode. through welding, you can repair a wide variety of things including: harrow disk repair with hobart 335a stick electrodes four- wheeler repair with hobart’ s hb- 28 solid wire. if you de velop unusual symptoms, see your supervisor. sparks fly off from the weld.
pdf the creation of a weld between met- als techniques using these processes does not usually involve pres- sure but may utilize a filler metal. perhaps the welding atmosphere and ventilation system techniques should be checked. the arc is struck between the workpiece and the tip of the electrode. wear correct eye, ear & body protection protectyour eyes and face with welding helmet properly fitted and with proper grade of filter plate ( see ansi z49. figure 1 illustrates the welding circuit for a typical pdf welding machine. use natural draftsor fans to keep the fumes away from your face.
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