Tips For Welding Boiler Tubes. To attain the minimum chrome requirements the pulsed MIG weld procedures with the vertical down clad welds had to attain minimum weld dilution 8 with consistent weld fusion on the carbon steel boiler tubes. On a 600Hp steam boiler.
The thin tube is welded to the thick tube and is usually welded by a plug-in method. 5 Guideline for evaluating quality of boiler TIP 0402-31 tube butt welds with ultrasonic testing Keywords Boilers Boiler tubes Nondestructive tests Ultr asonic tests Welding Butt joints Butt welds Additional information Effective Date of Issue. In the case of a boiler drum for example after welding of the drum joints the entire drum can be heated to a specified temperature 590C or above in a special furnace for a definite period of time.
Because these tubes will be at high service temperature they should be welded with one of the nickel based F43 filler metal as per the KOBELCO table above to transition the large coefficient of expansioncontraction mismatch between the T11 and T347 material.
Yes i have welded boiler tubes. Make sure to make the horizontal tie-ins last on the vertical beadsthat way you have a transition of weld metal on starts and stops to minimize potential undercutting craters etc. David Bennett Chairman Corrosion Probe Inc. You do not have the required permissions to view the files attached to this post.