Question

1. arc strike happens due to?

a. spatters
b. high current
c. exposed electrode
d. improper start

1. what alternatives can be employed to reduce the impact of magnetic arc blow?

a. increase welding amperage/current
b. change welding machine from ac to dc
c. use rectifier type welding machine
d. use generator type welding machine

1. a welder qualification test requirement is determined by?

a. ability to understand and perform joint design
b. ability of a welder to deposit sound weld metal as per wps
c. welders ability to calibrate welding equipment
d. asme ix

1. electrode designated e6010 is specially designed for use on?

a. ac - dc
b. ac only
c. dcep
d. dcen

1. which factors has not contributed to the occurrence of porosity??

a. welder uses excessive long arc when using e7018
b. magnetic arc blow
c. moisture from electrode, base metal, and surroundings
d. thick base materials

1. which of the following electrode is not use in smaw?

a. e6013 c. e7010 - p
b. er70s d. e7018 - b2l

1. what type of weld does welding symbol shown represent?

a. v - cut groove
b. v - butt joint
c. single bevelled weld
d. single - v weld

Explanation:

1. Arc strike occurs mainly due to improper start of the welding process.
2. Changing the welding machine from AC to DC can reduce the impact of magnetic arc blow as DC current has more stable arc characteristics compared to AC.
3. A welder qualification test requires the ability to deposit sound weld metal as per the Welding Procedure Specification (WPS) which is a key indicator of welding quality.
4. E6010 electrodes are designed for use with DCEP (Direct - Current Electrode Positive) as they provide good penetration and are suitable for vertical - down welding.
5. Magnetic arc blow is related to magnetic field effects on the arc and does not contribute to porosity which is mainly caused by gas entrapment during solidification.
6. ER70S is a filler metal for Gas Metal Arc Welding (GMAW) and not used in Shielded Metal Arc Welding (SMAW).
7. The given welding symbol represents a V - Butt joint.

Answer:

1. d. Improper start
2. b. Change welding machine from AC to DC
3. b. Ability of a welder to deposit sound weld metal as per WPS
4. c. DCEP
5. b. Magnetic arc blow
6. b. ER70S
7. b. V - Butt joint