id	keyword
fis-2172	fatigue
fis-2172	crack
fis-2172	doi
fis-2172	metal
fis-2172	steel
fis-2172	weld
fis-2172	propagation
fis-2172	x70
fis-2172	joints
fis-2172	microstructure
fis-2172	api
fis-2172	materials
fis-2172	zone
fis-2172	pipeline
fis-2172	energy
fis-2172	growth