Question

what does the number \100\ in the electrode classification e10018 mean?
minimum tensile strength
flux coating composition and polarity
welding position
none of the above

Explanation:

In electrode classification (e.g., E10018), the first two or three digits (here "100") represent the minimum tensile strength of the weld metal in ksi (kips per square inch). The other options: flux coating composition and polarity are related to the last two digits (here "18" - "1" for welding position and "8" for flux type and polarity), welding position is part of the last two - digit code (the first digit of the last two digits, e.g., "1" in "18" for certain positions).

Answer:

minimum tensile strength