p10-5 task 1

Question 1

solar flux must be mixed with _____ before being used.

1. alcohol
2. oil
3. gas
4. solvent

Answer 1

a. alcohol

Question 2

the element in stainless steel that oxidizes very readily is

1. silicon
2. nickel
3. chromium
4. molybdenum

Answer 2

c. chromium

Question 3

a backing purge is sometimes used in the GTAW on stainless steel process to prevent

1. atmospheric contamination
2. filler metal from discolouring
3. undercut
4. build up of root pass

Answer 3

a. atmospheric contamination

Question 4

in the filler rod designation ER316L the number 316L refers to the

1. minimum tensile strength of the rod
2. chemical composition of the rod
3. shear strength of the rod
4. weld specification

Answer 4

b. chemical composition of the rod

Question 5

the preferred current for welding stainless steel with GTAW process is

1. AC
2. DCEN
3. DCEP
4. ACSP

Answer 5

b. DCEN

Question 6

which electrode is preferred for GTAW on stainless steel?

1. pure tungsten
2. 1% thoriated tungsten
3. 2% thoriated tungsten
4. zirconium alloyed tungsten

Answer 6

c. 2% thoriated tungsten

Question 7

generally, the current range for GTAW on stainless steel is ______ currents used for mild steel.

1. higher than
2. lower than
3. the same as

Answer 7

b. lower than

Question 8

solder flux loses its effectiveness when

1. higher currents are used
2. backup gas is used
3. more than one pass is required
4. a high-frequency start is required

Answer 8

c. more than one pass is required

Question 9

a method, other than gas purging, used to protect the backside of a stainless steel weld is the

1. application of solar flux
2. application of varnish
3. underhand welding
4. deposit of a copper root bead

Answer 9

a. application of solar flux

Question 10

solar flux used for stainless steel is

1. type A
2. type B
3. type 16
4. type 202

Answer 10

b. type B

Question 11

on multi-pass welds, flux must be applied

1. with a spray gun
2. to the filler rod and workpiece
3. to the entire surface of the work piece
4. before each pass

Answer 11

d. before each pass

Question 12

to control carbide precipitation you need to

1. maximize heat input
2. minimize heat input
3. use a silicone filler rod
4. decrease or travel speed

Answer 12

b. minimize heat input