TY - JOUR
T1 - Friction stir welding of DH36 steel
AU - Reynolds, A. P.
AU - Tang, W.
AU - Posada, M.
AU - DeLoach, J.
PY - 2003/12
Y1 - 2003/12
N2 - Hot rolled DH36 carbon steel, 6-4 mm in thickness, was friction stir welded at speeds of 3.4 mm s-1 (8 in min-1), 5.1 mm s -1 (12 in min-1), and 7.6 mm s-1 (18 in min-1). Single pass welds free of volumetric defects were produced at each speed. The relationships between welding parameters and weld properties are discussed. Optical microscopy, microhardness testing, and transverse and longitudinal tensile tests have been performed. Bainite and martensite are found in the nugget region of the friction stir welds whereas the base material is comprised of ferrite and pearlite. The maximum hardness is observed in the weld nugget, and the hardness decreases gradually from the weld nugget, through the heat affected zone, to the base metal. Tensile testing also indicates overmatching of the weld metal relative to the base metal. Maximum hardness and longitudinal (all weld metal) tensile strengths increase with increasing welding speeds. Weld transverse tensile strengths are governed by the base metal properties, as all transverse tensile bars fail in the base metal.
AB - Hot rolled DH36 carbon steel, 6-4 mm in thickness, was friction stir welded at speeds of 3.4 mm s-1 (8 in min-1), 5.1 mm s -1 (12 in min-1), and 7.6 mm s-1 (18 in min-1). Single pass welds free of volumetric defects were produced at each speed. The relationships between welding parameters and weld properties are discussed. Optical microscopy, microhardness testing, and transverse and longitudinal tensile tests have been performed. Bainite and martensite are found in the nugget region of the friction stir welds whereas the base material is comprised of ferrite and pearlite. The maximum hardness is observed in the weld nugget, and the hardness decreases gradually from the weld nugget, through the heat affected zone, to the base metal. Tensile testing also indicates overmatching of the weld metal relative to the base metal. Maximum hardness and longitudinal (all weld metal) tensile strengths increase with increasing welding speeds. Weld transverse tensile strengths are governed by the base metal properties, as all transverse tensile bars fail in the base metal.
UR - http://www.scopus.com/inward/record.url?scp=1642577179&partnerID=8YFLogxK
U2 - 10.1179/136217103225009125
DO - 10.1179/136217103225009125
M3 - Article
AN - SCOPUS:1642577179
SN - 1362-1718
VL - 8
SP - 455
EP - 461
JO - Science and Technology of Welding and Joining
JF - Science and Technology of Welding and Joining
IS - 6
ER -