An investigation of the strength of samples of heat-treated steel with manual welding
Conclusions
- 1.
The aggregate strength of weld joints of elements of heat-treated steel is lower than the strength of the steel by 4% for 75×75×8 mm angles of class C40 VMSt.3ps steel, by 14% for 75×75×8 mm angles of class C45 VMST.3ps steel, by 26% for 75×50×8 mm angles of class C55 VMSt.3ps steel, by 44% for 200×200×20 mm angles of class C70 14G2 steel, by 10% for 200×200×16 mm angles of class C60 200×200×16 mm angles of class C60 10G2S1 steel, by 39% for 200×200×16 mm angles of class C80 10G2S1 steel, by 28% for 200×200×12 mm angles of class C85 18GFps steel, and by 33% for 200×200×12 mm angles of class C105 18GFps steel.
- 2.
The design strength of the heat-treated steel of any strength class may be determined from the design strength of the steel in the hot rolled condition using the proposed coefficients of effectiveness according to the formula Rht = KefR, where R is the design strength of the original hot rolled steel and R=kσ T unweld .
- 3.
In all of the investigated cases the aggregate strength of the weld joints was higher than the strength of those in the hot rolled steel by 4–44%. Therefore the primary criterion for the choice of a given steel should be the ductility of the welded element as expressed by the elongation or the σT/σb ratio.
Keywords
Welding Ductility Weld Joint Rolled Condition Strength ClassPreview
Unable to display preview. Download preview PDF.
Literature Cited
- 1.I. K. Florov, Author's Abstract of Candidate's Dissertation [in Russian], Central Scientific-Research Institute for Structural Parts, Kucherenko (1969).Google Scholar
- 2.Provisional Figures for the Planning of Steel Designs of SN 347-66 High Strength Steel [in Russian], State Committee of the Council of Minsters of the USSR for Construction, State Committee of the Council of Ministers of the USSR on Construction Work, Moscow (1967).Google Scholar
- 3.Metals, “Methods for tensile testing,” State Standard of the USSR, GOST 1497-61, Moscow (1968).Google Scholar
- 4.A. Ya. Brodskii and V. N. Tolmacheva, “An investigation based on steel designs of the weldability of types 14G2, 14KhGS, and 15GS nickel-free low-alloy steels,” in: Proceedings of the Central Scientific-Research Institute for Structural Parts [in Russian], Issue 4, Gosstroiizdat, Moscow (1961).Google Scholar
- 5.E. M. Kuzmak, in: Proceedings of the Gubkin Moscow Institute of the Petrochemical and Gas Industry [in Russian], Issue 70, Nedra, Moscow (1967).Google Scholar