Effect of dilution on fatigue behaviour of welded joints produced by low-transformation-temperature fillers

ABSTRACT

Low-transformation-temperature (LTT) fillers with various martensitic transformation start (M_s) temperatures were used to produce fillet welds. In comparison with conventional welds, the fatigue strength of the LTT fillet welds offers a significant improvement, with a minimum increase of 145%. Owing to the substantial dilution of base metal, the Cr and Ni alloying elements in the LTT weld metals decrease, resulting in an increase of the M_s temperatures. Therefore, the fillet welds produced using the LTT filler material with the lower M_s temperature (92°C) exhibit a larger compressive residual stress and higher fatigue strength.

KEYWORDS:

• Low-transformation-temperature filler
• dilution
• fatigue strength
• residual stress
• martensitic transformation start temperature

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Shipin Wu http://orcid.org/0000-0002-6046-2448

Dongpo Wang http://orcid.org/0000-0002-4733-2366

Zhi Zhang http://orcid.org/0000-0003-3703-1719

Chengning Li http://orcid.org/0000-0002-5851-9679

Xiuguo Liu http://orcid.org/0000-0002-8653-3451

Zhijin Zhou http://orcid.org/0000-0003-0402-7510

Xinjie Di http://orcid.org/0000-0002-5660-3703

Correction Statement

This article has been republished with minor changes. These changes do not impact the academic content of the article.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [grant number 51774213] and the Regional Demonstration Project of Marine Economic Innovation and Development [grant number BHSF2017-10] and this is also supported by the State Oceanic Administration of China and Tianjin Oceanic Administration.