WHAT’S SAFETY?

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?• - are the parts of an

ARC welder?• - are some

characteristics of a good bead?• - are the settings for a

6011 electrode and 7018 electrode?

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?

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– Voltage is 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.

– Amperage is a measure of electrical current flowing through a circuit• Setting made on welder

– Resistance is 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