The absorption of hydrogen into the weld pool is the primary cause of _____.
a. undercut
b. excessive reinforcement
c. porosity
d. solidification cracks
Question 2
The filler metal alloys that are used in roughly 85 percent of aluminum welds are _____.
a. ER4043 and ER4145
b. ER4043 and ER5356
c. ER4145 and ER5356
d. ER5183 and ER5554