BlueprintExercises

Welding symbols

A welding symbol tells the welder what weld to make, where, and how big. Work through these lessons in order. Every lesson has exercises in AWS A2.4 (US) and ISO 2553 (Europe).

7 lessonsPractice testAWS A2.4 · ISO 2553Certificate with Pro

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0 of 8 doneStart lesson 1
  1. 1

    Arrow side or other side

    Read which side of the joint gets the weld. The first thing to check on any welding symbol.

  2. 2

    Weld types

    Fillet, square, V, bevel, U, J, plug and spot weld symbols, with AWS and ISO names.

  3. 3

    Fillet weld size

    Leg size in AWS. Throat (a) and leg (z) in ISO 2553, and how to convert between them.

  4. 4

    Length and pitch

    Intermittent welds: length-pitch in AWS, n × l (e) in ISO 2553.

  5. 5

    Weld all around and field welds

    The circle and the flag where the arrow meets the reference line.

  6. 6

    Read the whole symbolHarder

    Side, size, length, pitch, all around and field weld in one go, plus working out the numbers yourself.

  7. 7

    Read the welds on an assemblyHarder

    A welded bracket with three symbols. Answer five questions about each drawing, like on a shop print.

  8. Practice test20 questions

    Mixed questions from every lesson. Use it to check what you know.

Reference