What should be watched for as an indication that the root pa

What should be watched for as an indication that the root pass is getting 100% penetration? Describe how the weld beads on a test plate should be cleaned. What cautions should be taken when welding on a pipe joint in a fixed position? Explain the acceptance criteria for a bend test. Explain how to bend test the strips cut from the 10 gauge to 14 gauge carbon steel sheet metal.

Solution

21. Jif there is jetting sound of electrode through the root of weld joint and if you see a keyhole at the leading edge of the molten weld pool, indicates that the root pass is getting 100% penetration,

22. The weld beads on a test plate should be cleaned by chipping hammer, hand wire brush, needle-scaler or hammer and punch. All the cleaning must be carried out in the welding position.

23. When welding on a pipe joint in a fixed position, the weld contour changes as the we wled from overhead to vertical position i.e the vertical has a high bead shape. Hence as the weld reaches the vertical position, using flame distance and torch angle the bead shape should be controlled.

24. The convex surface of bend are examined for surface discontinuites. The acceptance criteria for a bend test is that the bend speciemen should not exceed acceptance limits of discontinuties i.e. the surface shall not contain any discontinuties.