Author Question: Due to its fast-freeze characteristics and limited slag production, the electrode used for the root ... (Read 17 times)

Kthamas · **on:** Jul 24, 2018

Due to its fast-freeze characteristics and limited slag production, the electrode used for the root pass of an
SMAW open-root pipe joint is the _____.

a. E9018
b. E7018
c. E6010
d. E4010

Question 2

A large amount of oxygen around flammable materials or sparks can cause _____.

a. slow, persistent oxidation of the electrodes
b. severe weakening of the root pass welds
c. rust or scale to enter the weld puddle
d. rapid and uncontrolled combustion