Fillet Gauge
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Flashcard · Definitions and Terminology

Name the five basic joint types.

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Name the five basic joint types.
Butt, corner, T, lap and edge.AWS A3.0M/A3.0:2020, joint types
Do you name a joint by the weld in it or by how the members sit?
By how the members sit before welding. A T-joint with a bevel groove weld is still a T-joint.AWS A3.0M/A3.0:2020, joint types and weld types
Can a butt joint take a fillet weld?
No. A fillet sits in a corner between two surfaces, and a butt joint has no corner.AWS A3.0M/A3.0:2020, weld types
Back weld or backing weld: which goes in before the groove weld?
The backing weld goes in before it; a back weld goes in after it. Both sit opposite the main weld.AWS A3.0M/A3.0:2020, weld types
List the groove shapes a drawing can name.
Square, V, bevel, U, J, flare-V and flare-bevel.AWS A3.0M/A3.0:2020, groove weld types
What is a surfacing weld for?
Building up or protecting a surface, not joining parts.AWS A3.0M/A3.0:2020, weld types
Each plate of a single-V butt joint has a 30° bevel. What is the groove angle?
60°. The bevel angle is one plate's cut; the groove angle is the total opening between both.AWS A3.0M/A3.0:2020, groove nomenclature
What goes wrong if the root face (land) is too thick, or too thin?
Too thick and the root will not melt through; too thin and it burns through.AWS A3.0M/A3.0:2020, groove nomenclature
Theoretical throat of an equal-leg fillet, as a multiple of its size?
About 0.707 times the size: corner to the sloping side of the largest 45° triangle that fits in the weld.AWS A3.0M/A3.0:2020, fillet weld size and throat
A concave fillet gauges 8 mm on both legs. Is it an 8 mm fillet?
Not necessarily. The dished face leaves a smaller triangle inside, so the throat governs and it can be undersized.AWS A3.0M/A3.0:2020, fillet weld size and throat
The drawing gives one fillet size and the two legs gauge unequal. Which leg sets the weld size?
The shorter leg.AWS A3.0M/A3.0:2020, fillet weld size
CJP versus PJP?
CJP: the weld reaches through the full thickness of the joint. PJP: the design stops part way through.AWS A3.0M/A3.0:2020, joint penetration terms