Abstract
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. 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. 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 (equivalent S235JRG1)
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