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1992
Report
Title
Erhöhung der Korrosionsschwingfestigkeit von Schweißverbindungen aus höherfestem Stahl durch optimierte Nachbehandlungsverfahren
Other Title
Improvement of corrosion fatigue behaviour of high-strength steel welds by means of optimized post weld treatments
Abstract
In this research work the fatigue behaviour of welded V-shaped specimens made of the steels FeE 355 KT and Fe E 690 V with two types of post weld treatment (TIG-dressing of the weld toe, shot peening of the weld toe) were examined. The specimens were submitted to random bending loading (variable amplitudes, spectrum loading with linear distribution of the amplitudes) under presence of a corrosive environment (artificial sea-water) until final fracture occurred. When compared to the aswelded state, shot-peening led to an increase of fatigue life by a factor of 3 to 10, depending on the material of the weld. TIG-dressing led to a factor of 13. The combination of both, TIG-dressing and subsequent shot-peening, led to an increase of fatigue life by a factor of 50 in the case of the Fe E 355 KT. On the other hand, if the influence of the corrosive environment on the TIG-dressed welds of Fe E 690 V was reduced by means of a cathodic protection, fatigue life could be improved by a factor of 1 00. The results of this research work show, that fatigue performance can be improved significantly, if the above mentioned post weld treatments are applied. It is now possible to apply the two steels with a higher efficiency, which will subsequently lead to a remarkable reduction of costs.
Author(s)
Corporate Author
Fraunhofer-Institut für Betriebsfestigkeit -LBF-, Darmstadt
Publisher
Fraunhofer LBF
Publishing Place
Darmstadt
Language
German
Keyword(s)
Betriebsfestigkeitsversuch
cathodic protection
corrosion
kathodischer Schutz
Korrosion
Kugelstrahlen
Offshore-Technik
offshore-technique
Schweißnaht
shot peening
TIG-dressing
variable amplitude loading
weldment
WIG-Aufschmelzen
Korrosionsbeständigkeit
Schweissverbindung
Stahl
Oberflächenbehandlung
Oberflächenverfestigung
Fertigung
Werkstoff
Bauteil
Salzwasser
Beanspruchungskollektiv
lebensdauersteigernde Maßnahme
Betriebsfestigkeit