Fatigue properties of longitudinal attachments welded using low transformation temperature filler

Abstract

In welded structures, fatigue properties are normally considered to be independent of mean stress owing to the presence of tensile residual stresses with a magnitude close to yield level. Introduction of compressive residual stresses by use of low transformation temperature welding consumables has been reported in the literature to have a positive influence on the fatigue strength. In this investigation new low transformation temperature welding consumables have been evaluated with respect to static strength, impact toughness, residual stresses and fatigue properties. Welds were produced in the base material Domex 700 MC, an extra high strength cold forming steel with minimum yield strength of 700 MPa. The improvement of fatigue strength was found to be 25 - 90% at 2 × 10⁶ cycles.

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References

Ohta

, Watanabe

, Matsuoka

, Maeda

, Suzuki

and Kubo

: ‘Fatigue strength improvement of box welds by low transformation temperature welding wire by PWHT’, Document XIII–1758–99, International Institute of Welding, 1999.

Machida

, Fujita

, Yoshiie

, Kubo

and Morikage

: ‘Improvement on fatigue strength of box weld on non-quenched steel by using low transformation temperature welding material’, Document XIII–1771–99, International Institute of Welding, 1999.

Hobbacher

: ‘Fatigue design of welded joints and components’, Document XIII–1539–96, International Institute of Welding, 1996.

Ohta

, Maeda

, Nguyen

and Suzuki

: ‘Fatigue strength improvement of box section beam by low transformation welding wire’, Document XIII–1759–99, International Institute of Welding, 1999.

Ohta

, Naoyuki

, Maeda

, Hiraoka

and Nakamura

: Int. J. Fatigue, 1999, 21, 113–118.

Chitoshi

and Anami

: ‘Fatigue strength improvement of welded joint by addition welding with low temperature metallurgical transformation electrode’, Document 1827–2000, International Institute of Welding, 2000.

Ohta

, Suzuki

and Maeda

: ‘Doubled fatigue strength of box welds by using low transformation temperature welding material’, Document XIII–1825–2000, International Institute of Welding, 2000.

Ohta

, Maeda

and Suzuki

: ‘Fatigue life extension by repairing fatigue cracks initiated around box welds with low transformation temperature welding wire’, Document XIII–1835–2000, International Institute of Welding, 2000.

Karlsson

, Bruins

, Gillenius

, Rigdal

and Goldschmitz

: Proc. Conf. Supermartensitic Stainless Steels ’99, Brussels, Belgium, May 1999, Belgian Welding Institute, 172–179.

10.

van den Broek

, Goldschmitz

, Karlsson

and Rigdal

: Svetsaren, 2001, 56, (2–3), 42–46.

11.

KȦhȮnen

and Olsson

K.-E.

: Proc. Int. Conf. on ‘Design and analysis of welded high strength steel structures’, Stockholm, Sweden, June 2002, Engineering Materials Advisory Services.

12.

Maddox

S. J.

: Proc. Int. Conf. on ‘Performance of dynamically loaded welded structures’, San Francisco, CA, USA, July 1997, Welding Research Council.