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Laser welded joint of steel material with excellent toughness of weld metal part and manufacturing method of laser beam welded joint of steel material with excellent toughness of weld metal part
Laser welded joint of steel material with excellent toughness of weld metal part and manufacturing method of laser beam welded joint of steel material with excellent toughness of weld metal part
PROBLEM TO BE SOLVED: To provide a laser beam-welded joint comprising a steel material having a tensile strength of 780 MPa or higher, and having the tensile strength of a weld metal portion of 780 MPa or higher and excellent ductility.SOLUTION: The weld metal of the laser beam-welded joint contains, by mass, 0.02-0.14% C, 0.006-0.05% Ti, 0.02% Al, 0.001% B, 0.02-0.05% O, and 0.33-0.53% Ceq (=C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14) (wherein Ceq is a carbon equivalent (mass%); and C, Mn, Si, Ni, Cr, Mo and V are the contents of respective alloy elements (mass%)), and has a microstructure including an acicular ferrite phase of 40% or more in an area ratio. A gas containing an oxygen-supplying gas is used as the shield gas for laser beam welding.
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机译：解决的问题：提供一种激光束焊接接头，该接头包括抗拉强度为780 MPa或更高，焊接金属部分的抗拉强度为780 MPa或更高且延展性极佳的钢材。激光束焊接接头的金属按质量计包含0.02-0.14％C，0.006-0.05％Ti，0.02％Al，0.001％B，0.02-0.05％O和0.33-0.53％Ceq（= C + Mn / 6 + Si / 24 + Ni / 40 + Cr / 5 + Mo / 4 + V / 14）（其中Ceq为碳当量（质量％）; C，Mn，Si，Ni，Cr，Mo和V为并且，具有针状铁素体相的面积率为40％以上的组织。包含供氧气体的气体被用作激光束焊接的保护气体。
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