APPLICATION OF VERY LOW YIELD STRENGTH CONSUMABLES IN THE ROOT PASS OF WELDMENTS TO PREVENT PREHEATING

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Authors
  1. Vuik, J.
  2. van Wortel, J.C.
  3. van Sevenhoven, C.
Corporate Authors
TNO Inst of Production and Logistics Research, Apeldoorn (Netherlands);Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
One of the problems that arise when welding structural steels, with a yield strength of 355 N/mm square and above, is the possible occurrance of cold cracking. The development of modern steel types has reduced this risk of cold cracking, and the availability of very low hydrogen electrodes reduced it even further. Hydrogen levels in the deposited weld metal of less than or equal to 3 ml/100 g are possible nowadays. When packed in vacuum packages, or sealed tins, the hydrogen content of these electrodes can be guaranteed up to the moment the welding operation is to be carried out. These developments give the contractors the option to weld structural steels wihtout preheating up to a thickness and chemical composition that would have been impossible then years ago. Still, despite all those developments, increasing thickness (restraint) or yield strength of the materials to be welded, makes preheating necessary again. This is also the case for repair welding of older constructional steels, with the corresponding higher carbon contents and/or carbon equivalents. For the situations where preheating still can't be omitted, the Dutch TNO Instittue of Production and Logistics Research has initiated the development of low hydrogen SMAW electrodes with a very low yield strength. TRUNCATED
Report Number
DREA-NAMT-93-2-PAP-7 — CONTAINED IN 99-00578
Date of publication
30 Apr 1993
Number of Pages
18
DSTKIM No
99-00585
CANDIS No
510312
Format(s):
Hardcopy;Document Image stored on Optical Disk

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