Concept:
AWS electrode classification:
\[
E - XX - YZ
\]
Step 1: Decode E6013.
• E → electrode
• 60 → tensile strength (60 ksi)
• 1 → all position welding
• 3 → coating type
Step 2: Interpretation.
The number 60 indicates minimum tensile strength of weld metal = 60,000 psi.
Final Answer:
\[
\boxed{\text{Minimum tensile strength of weld metal}}
\]