1. Ag I Welding Unit 2

2.  Wide variety available to allow welder to do different jobs and weld in different positions  Positions ◦ Flat, horizontal, vertical up and down, overhead  Some electrodes are suitable for all positons, others only 1 or 2

3.  4-5 digit number  Numbers preceded by the letter “E” to indicate that the number describes an electrode E 6011

4.  E 6013  E-Electrode  60—tensile strength (Thousands of pounds) ◦ Tensile strength is the amount of pull the weld can withstand  1—type of welding the electrode is capable of doing  3—depth of penetration

5.  The same as a 4 digit except ◦ First 3 numbers represent tensile strength ◦ Fourth number represents welding position ◦ Fifth number refers to depth of penetration

6.  6011 ◦ Most commonly used ◦ Not easy for beginers to use to make an attractive weld  6013 ◦ Popular for beginning welders ◦ Inexpensive ◦ Easy to use

7.  Helmet with a No. 10 shaded lens must be worn  Safety glasses under the helmet or on your person to be worn when chipping slag  Other PPE that was already discussed

8.  Also called arc welding or stick welding  Shielded refers to the gaseous cloud that forms around the weld as the flux burns  The flux removes impurities and floats them to the top of the weld to form a layer called slag

9.  The percentage of time that a welder can operate without overheating  Example: a 20 percent duty cycle welder should only weld 12 minutes out of every hour.

10.  Amps-the measure of the rate of flow in a conductor ◦ A conductor is any material that permits current to move through it  Volts- the measure of electrical pressure  Watt-the measure of electrical energy available for work that can be done

11.  Alternating Current (AC)-current that reverses in direction of flow frequently. ◦ In the U.S. power plants produce electricity that reverses direction of flow 60 times per second. This is referred to as 60-cycle current  Direct Current (DC) ◦ Really generators ◦ Current only flows in 1 direction ◦ Can be set for both straight (neg.) and reverse (pos.) polarity

12.  Metal Table  Curtains around table to protect others from the flash of the arc  If working outside the booth, set up portable curtains to protect others

13.  Electrode Holder ◦ Spring loaded device with an insulated handle ◦ Used to grip the electrode  Ground Clamp ◦ Spring loaded clamp ◦ Not insulated like the electrode holder ◦ Should be connected to the welding table

14.  Arc from a welder has a temp of 9000 ˚F