ARC WELDING

Problem:

Perform a "T" weld in the flat position keeping distortion to a minimum.

Materials:
 1. 2 - ¼" x 2" x 4" metal plates.
 2. Appropriate electrode selected from those in the welding booth.
 3. 1 - Brick to rest metal against.

Directions:
 1. Prepare the metal; grinding, cleaning, etc.
 2. Secure the metal.
 3. Select electrode from those in welding booth and set welder amperage.
 4. Record the type of rod and welder amperage which you use on page 2.
 5. Position metal as shown.
 6. Tack as needed.
 7. Perform weld, welding on one side only.
 8. Hand your weld to the contest official.  He will cool your metal.
 9. Put contestant number on the back side of the welded plates and on this sheet.
 10. Turn in work and this sheet. Be sure to include your name, your contestant number, your chapter, the welder amperage which you used, and the rod number which you used.

Welder Number/Name

Amperage setting

Rod number

                                                                             Points
Evaluation:                                                   Possible         Earned

1. Metal positioned properly                              5

2. Proper selection of electrode                          5

3. Correct welder amperage                               5

4. Distortion (2 degree = 1 point)                       5

5. Weld appearance (correct arc length,
 temperature, width, and face)                            5

6. Safe work habits                                            5

7. Weld passes the guided bend test                   10

8. Points from identification and problem
        solving                                                       10
 

Total ------------------------------------------------------------          _______

Arc Welding Problem Solving

1. Assuming you are welding on mild steel, which of the four electrodes provided should be used to weld sample #1a with sample #1b?

 A. A
 B. B
 C. C
 D. D

2. Assuming you are welding medium to high carbon steel, which of the four electrodes should be selected when welding?

 A. Electrode 2A
 B. Electrode 2B
 C. Electrode 2C
 D. Electrode 2D

3. The duty cycle of welder #3 is:

 A. 20%
 B. 45%
 C. 80%
 D. 100%

4. The maximum wire speed setting in inches per minute for the MIG welder labeled #4 is:

 A. 39
 B. 58
 C. 100
 D. 220

5. Setting the amperes of machine #5 is done by:

 A.   Adjusting the wire speed
 B. Adjusting the dial
 C. Plugging into a different tap on the welder
 D. Adjusting the voltage

6. The item tagged number #6 is the:

 A.  Tip
 B. Collet
 C. Hub
 D. Spacer
7. What should the working pressure be for welder #7a when using gas #7b?

 A. 10 psi
 B. 25 psi
 C. 25 cfh
 D. 30 cfh

8. The item tagged #8 is the:

 A.   Power reset
 B. Voltage control
 C. Fuse
 D. Warning light

9. Which of the following cannot be used as a shielding gas for a MIG welder?

 A. Gas 9A
 B. Gas 9B
 C. Gas 9C
 D. All can be used as a shielding gas

10. Which type of shielding gas should be used when welding items 10a & 10b together?

 A.   Carbon dioxide/argon mix
 B. Argon
 C. Carbon dioxide
 D. No shielding gas is needed