During welding inspection of structural steel connections, what indicates a proper fillet weld profile?
Correct Answer
B) Slightly convex to flat profile with smooth transition
A proper fillet weld should have a slightly convex to flat profile with smooth transitions to the base metal. This indicates proper penetration and strength without excessive buildup or defects.
Why This Is the Correct Answer
A slightly convex to flat profile with smooth transitions indicates optimal weld quality and structural integrity. This profile demonstrates proper heat input, adequate penetration, and good fusion with the base metal without creating stress concentrations. The smooth transitions ensure load transfer efficiency and prevent crack initiation points that could compromise the connection's strength.
Why the Other Options Are Wrong
Option A: Convex profile with excessive buildup
A concave profile indicates insufficient weld metal and poor penetration, while undercut creates stress concentration points that significantly weaken the connection and can lead to premature failure under load.
Option D: Concave profile with visible undercut
Irregular profiles and visible porosity indicate serious welding defects that compromise structural integrity, reduce load-bearing capacity, and create potential failure points in the steel connection.
Memory Technique
Think 'SOFT' - Slightly convex, Optimal profile, Flat acceptable, Transitions smooth. Avoid the extremes of too concave or too convex.
Reference Hint
AWS D1.1 Structural Welding Code - Steel, Chapter 6 (Inspection) and visual acceptance criteria tables
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