The purpose of a surfacing weld is not to join metal parts but to add a hard metal layer to a part. Surfacing welds are indicated by two half circles on the reference line. You apply a back weld at the back of a single groove weld, whereas you apply a backing weld before a groove weld to act as a support. Back or Backingīack and backing welds are indicated by a half-circle on the reference line. A seam weld is a continuous weld that you apply to join two metal pieces. Seam welds are indicated by a circle on the reference line with two parallel lines running through it on the horizontal plane. Stud welds, which you apply to join a fastener to a metal part, are represented by a circle on the reference line with an “X” inside it. Both types of welding involve using electrodes to join sheet metal pieces, but you can use projection electrodes to weld thicker pieces. Spot or ProjectionĪ circle on the reference line indicates spot and projection welds. These welds involve joining overlapping parts, at least one of which has a round or elongated hole. Plug and slot welds are indicated by a square or rectangular shape on the reference line. Some of the most common symbols include: FilletĪ fillet weld, where you join two metal pieces that are perpendicular to a tee joint, is indicated by a fin-like shape on the reference line. If it’s below the reference line, it shows that you need to apply the weld to the other side. If the shape is below the reference line, it indicates that you should apply the weld on the join corresponding to the arrow side. The tail of the reference line may point to additional information regarding the welding process.Īttached to the reference line may be a geometric shape or parallel lines, showing what kind of weld you need to perform. Connected to the reference line is an arrow that points upward or downward, depending on where you need to place the weld.
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January 2023
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