Question

1. true or false? when an fcaw electrode is being fed through the wire feed mechanism, care must be taken not to flatten or crush the flux - cored wire.

answer:

1. which of the following is not a function of flux in an fcaw electrode?

a. add deoxidizers.
b. add hydrogen.
c. form a slag covering.
d. add arc stabilizers.
answer:

1. which of the following is a metal - cored electrode wire?

a. er70s - 6.
b. er70c - 6.
c. er70m - 6.
d. e70t - 6.
answer:

1. a number ____ filter lens is recommended for gmaw welding of steel with a current of 200a.

a. 10
b. 11

Explanation:

1. Flux - cored wire in FCAW is delicate and can be damaged by flattening or crushing during wire - feed, so the statement is true.
2. Flux in FCAW is used for adding deoxidizers, forming a slag covering, and adding arc stabilizers, but not for adding hydrogen. Hydrogen is generally an unwanted element in welding as it can cause defects.
3. ER70M - 6 is a metal - cored electrode wire. ER70S - 6 is a solid wire, ER70C - 6 is not a standard metal - cored wire type, and E70T - 6 is a flux - cored wire.
4. For GMAW welding of steel with a current of 200A, a number 11 filter lens is recommended as it provides appropriate shade for this welding current level.

Answer:

1. True
2. B. Add hydrogen.
3. C. ER70M - 6.
4. B. 11