- Slides: 6
Arc Welding Equipment
Arc Welding n Arc welding n Shielded metal arc welding – uses electricity to heat and melt the metal. – Where fusion is produced by heating with an arc between electrode and the work piece. n An electrode is a bare metal rod which is usually coated with chemical compounds called flux. – The flux forms a blanket of smoke and gas that shields the weld puddle from the air.
Welding equipment n n n Two cables, No. 2 gauge, are required. The electrode holder Ground Clamp Chipping HammerWire Brush Pliers Safety GlassesWelding Shield Gloves
Electrodes n n Convey electric current from the welding machine into a hot arc. Covered in flux – When heated flux turns to a gas shield that protects the weld from oxygen – Flux mixes with the metal and floats to the top as slag
Classifying Electrodes n n n Ex E 7014 E = electrode is used for electric welding. The first two digits of a four indicate tensile strength in thousands psi. – EX: E 7014 electrode produces a weld with 70, 000 psi of tensile strength – If the number has 5 digits the 1 st 3 are for tensile Strength n n The next to last digit indicates welding position for which the electrode is recommended. The last digit indicates the operating characteristics of the electrode