After today YOU should be able to… • Identify parts of an ARC welder with 100% accuracy on a written quiz. • Recognize welding bead distortion caused by speed or amperage setting problems. • Compare and contrast the settings and usages of 6011 electrode and 7018 electrode with 100% accuracy on an oral quiz.
Just a few questions… What? Why? - is it important to know the correct part names for an ARC welder? - would being able to diagnose the cause of a bad bead or weld be helpful? -would it be important to have your welder set correctly for different types of electrodes? • - are the parts of an ARC welder? • - are some characteristics of a good bead? • - are the settings for a 6011 electrode and 7018 electrode?
Terms • SMAW- Shielded Metal Arc Welding – Where a weld is created from heat caused by an electrical arc between a consumable electrode and work metal • Electrode- a bare metal rod coated in Flux • Flux- a chemical compound that burns at high temperatures and forms a dome of protective gas around weld
Terms • Voltageis a measure of electrical pressure. • Most welders operate on a 220 volt source. A welder changes or transforms the 220 volt pressure to a much lower pressure at the electrode, usually between 15 and 25 volts. • Amperageis a measure of electrical current flowing through a circuit • Setting made on welder • Resistanceis the opposition to the flow of current in a circuit. • Causes heat • Duty cycle is the percentage of a 10 minute period that a welder can operate at a given current setting
Vs. • A match can heat up tin foil, but has no chance at warming up a 1” solid steel plate • It’s the same with your welder • Miller’s website http://www.millerwelds.com/resources/calculators/stick_amperage_calculator.php
IT’S REVIEW TIME! • What are the parts of a welder? • What terms did we cover in class? • How do you weld safely? • Describe 6011 and 7018 electrodes • Describe the qualities of an ideal bead