Solder joints are used in piping systems that carry liquids no hotter than _____.
a. 100F (38C)
b. 200F (93C)
c. 250F (121C)
d. 300F (149C)
Question 2
If a filler metal cannot be cleaned, it should _____.
a. be ground to a point
b. not be used
c. be used only with backing gas
d. be used only with backup flux