Joint Design and Weld Joint Types Flashcards
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Read the first 7 Joint Design and Weld Joint Types flashcards as text
The theoretical throat of a fillet weld is defined as the distance from the joint root to the:
Answer: Hypotenuse of the largest right triangle inscribed in the weld cross section
The theoretical throat is the perpendicular distance from the root to the hypotenuse of the largest right triangle that can be inscribed within the fillet weld cross section.
For an equal-leg fillet weld with legs at 45°, the theoretical throat is approximately what fraction of the leg size?
Answer: 0.707 × leg size
For a 45° equal-leg fillet weld, the theoretical throat equals leg size × sin(45°) = leg size × 0.707, which is approximately 70.7% of the leg dimension.
Per AWS D1.1, what is the minimum fillet weld size required when the thicker base metal being joined exceeds 3/4 inch (19 mm)?
Answer: 5/16 inch (8 mm)
AWS D1.1 Table 5.8 specifies a minimum fillet weld size of 5/16 inch when the thicker base metal member exceeds 3/4 inch to ensure adequate fusion and heat input.
A plug weld is made by:
Answer: Depositing weld metal in a hole in the overlapping member to fuse it to the underlying member
A plug weld is made in a circular hole punched or drilled in one member; weld metal fills the hole and fuses to the surface of the underlying member, joining the two overlapping pieces.
The root face (land) in a groove weld joint is included primarily to:
Answer: Prevent burn-through and provide a surface for the root pass to fuse against
The root face provides a small flat area at the base of the groove that helps control heat and prevents the arc from burning through while still allowing complete root fusion.
Which weld joint type is generally preferred for members subject to fatigue loading because it minimizes stress concentrations?
Answer: Butt joint with complete joint penetration
A CJP butt joint provides a smooth load path through the weld with no abrupt changes in cross section, minimizing the stress concentrations that initiate fatigue cracking.
A slot weld differs from a plug weld in that:
Answer: A slot weld is made in an elongated hole rather than a circular hole
A slot weld is made in an elongated (rectangular or oval) opening in the overlapping member, whereas a plug weld is made in a circular hole; both fuse the two overlapping members together.