CSWIP 3.1: Question with Answer and Explanation – Part 9

CSWIP 3.1 QUESTION AND ANSWER SERIES

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CSWIP 3.1: Question with Answer and Explanation – Part 1

CSWIP 3.1: Question with Answer and Explanation – Part 2

CSWIP 3.1: Question with Answer and Explanation – Part 3

CSWIP 3.1: Question with Answer and Explanation – Part 4

CSWIP 3.1: Question with Answer and Explanation – Part 5

CSWIP 3.1: Question with Answer and Explanation – Part 6

CSWIP 3.1: Question with Answer and Explanation – Part 7

CSWIP 3.1: Question with Answer and Explanation – Part 8

CSWIP 3.1: Question with Answer and Explanation – Part 9

CSWIP 3.1: Question with Answer and Explanation – Part 10

CSWIP 3.1: Question with Answer and Explanation – Part 11

CSWIP 3.1: Question with Answer and Explanation – Part 12

CSWIP 3.1: Question with Answer and Explanation – Part 13

CSWIP 3.1: Question with Answer and Explanation – Part 14

CSWIP 3.1: Question with Answer and Explanation – Part 15

CSWIP 3.1: Question with Answer and Explanation – Part 16

CSWIP 3.1: Question with Answer and Explanation – Part 17

CSWIP 3.1: Question with Answer and Explanation – Part 18

CSWIP 3.1: Question with Answer and Explanation – Part 19

CSWIP 3.1: Question with Answer and Explanation – Part 20

1) When measuring arc voltage, where should the measuring …

a.	Across the terminals of the power source
b.	Across the arc and as near as practical to the arc
c.	Across the power source positive terminal and earth cable
d.	It does not matter – anywhere in the circuit

The voltmeter may be connected only across the circuit (to the workpiece and as close as possible to the electrode!)
The ammeter may be connected at any point in the circuit.

2) Which of the following is NOT a fusion welding process?

a. ( answer )	Friction welding
b.	Gas tungsten arc welding
c.	Resistance welding
d.	Laser welding

Rotary friction welding is a solid-state joining process
Welding is regarded as a joining process in which the work pieces are in atomic contact.
Weld is A permanent union between materials caused by heat, and or pressure (BS499)
Friction welding:

3) What is the maximum OCV allowable to initiate an arc when using AC current?

a.	1000V
b.	10V
c. ( answer )	90V
d.	900V

4) Why is the OCV capped at this voltage setting?

a.	To save electricity
b.	To prevent exploding of the consumable
c.	Allow smooth transition into welding voltage range
d. ( answer )	To reduce the risk of fatality

See previous question!

The prevention of electrical shock from welding equipment relies on three major principles.

5) A typical minimum OCV requirements for MMA (111) using filler rutile electrode …

a.	40V
b.	120V
c.	100V
d. ( answer )	50V

6) A typical minimum OCV requirements for MMA (111) using basic electrode would be:

a. ( answer )	70V
b.	40V
c.	100V
d.	20V

7) Heat input can be altered from the original procedure according to EN1011, …

a.	+10%
b.	+20%
c. (answer )	+25%
d.	+30%

8) A butt weld has been made by MMA in a 50mm thick impact tested steel plate. The welding electrode used was a basic type, 5mm diameter. The measured welding parameters for one of the runs was 220 amps, 21 volts, using DC+ve polarity, and a ROL of 270mm per min. What would be the arc energy?

a.	Insufficient information given to calculate the arc energy
b.	1.54kJ/mm
c. ( answer )	1.026kJ/mm
d.	2.82kJ/mm

HI = (220*21) / ( 270/60*1000) = 1.026kJ/mm

Pls note for: what is ROL & Travel speed in MMA?

9) A butt weld has been made by MMA in a 50mm thick impact tested steel plate. The welding electrode use was a basic type, 5mm diameter. The measured welding parameters for one of the runs was 250 amps, 24 volts, using DC+ve polarity, and a ROL of 180mm per min. What would be the Arc energy?