Improving the fatigue strength of impaired welds by overloading

0496502 - ÚTAM 2019 RIV NL eng C - Conference Paper (international conference)
Gajdoš, Lubomír - Šperl, Martin - Burgos Braga, A.
Improving the fatigue strength of impaired welds by overloading.
Materials Today: Proceedings. Amsterdam: Elsevier, 2018, s. 26753-26759. ISSN 2214-7853.
[Danubia-Adria Symposium on Advances in Experimental Mechanics /34./. Trieste (IT), 19.09.2017-22.09.2017]
R&D Projects: GA TA ČR(CZ) TE02000162
Institutional support: RVO:68378297
Keywords : overloading * impaired welds * fatigue strength * low-C steel ČSN 411373 * gaussian distribution
OECD category: Audio engineering, reliability analysis

The defects in the weld can be defined as irregularities in the weld metal produced due to incorrect welding parameters or wrong welding procedures or wrong combination of filler metal and parent metal. Various welding defects can be classified into groups such as cracks, porosity, solid inclusions, lack of fusion and inadequate penetration, imperfect shape and miscellaneous defects. A lack of root fusion (LRF) is one of the weld defects which may develop to a crack and cause failure of the gas pipeline. They also reduce the fatigue limit. In order to investigate the positive effect of overloading of welded joints with LRF on their fatigue properties fatigue tests were carried out on strip-type specimens taken from a helically welded pipe ø 630/7 mm made from low-C steel ČSN 411373.
Permanent Link: http://hdl.handle.net/11104/0292274