Effect of weld on the mechanical properties of high strength and ultra-high strength steel tubes in fabricated hybrid sections

Javidan, Fatemeh; Heidarpour, Amin; Zhao, Xiao‐Ling; Hutchinson, Christopher; Minkkinen, Jussi

doi:10.1016/j.engstruct.2016.03.046

Cited by 70 publications

(56 citation statements)

References 41 publications

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“…Nowadays, high-and ultrahigh-strength steels have become common in different applications such as skyscrapers, bridges, cars, cranes, and pipelines and in other applications in which it is desired to minimize the weight of the structure or to minimize the material cost [1][2][3]. Often, these steels have low alloying elements to minimize the cost of the steel to make it a more cost-efficient option over other high-or ultrahigh-strength materials such as titanium alloys or maraging steels.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, low-alloyed high-and ultrahigh-strength steels often have low carbon content as well [1,4]. However, often, the welding of these low-carbon, low-alloyed steels is demanding as, unlike traditional structural steels, the welds must cool quickly to avoid loss of crossweld tensile properties [2]. This is the opposite of traditional steels for which rapid weld cooling can induce hardening and a loss of toughness.…”

Section: Introductionmentioning

confidence: 99%

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Effect of enhanced cooling on mechanical properties of a multipass welded martensitic steel

Laitila

Larkiola

2019

Weld World

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The effect of forced cooling using heat sinks on the mechanical properties and interpass waiting time of two-pass welds has been studied for a martensitic steel with a yield strength of 960 MPa when the interpass temperature was 100°C. Cross-weld tensile and − 40°C Charpy-V impact toughness properties were examined. The use of heat sinks is shown to result in a beneficial increase of the cross-weld yield strength but at the expense of the yield-to-tensile strength ratio. Due to its particularly detrimental effect on the heat-affected zone (HAZ) toughness of multipass welds, special attention was given in the Charpy-V toughness of the intercritically reheated coarse-grained HAZ (ICCGHAZ) by also testing simulated ICCGHAZs. It is shown that forced cooling has a beneficial effect in respect of the toughness of this simulated subzone and on the Charpy-V toughness of the HAZ of the actual welds. The interpass cooling time during the two-pass welding was reduced by 37%. The results indicate that, in the case of high-strength steels, it may be possible to simultaneously improve both welding productivity and mechanical properties by using forced cooling down to 100°C to reduce waiting time between weld passes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of enhanced cooling on mechanical properties of a multipass welded martensitic steel

Laitila

Larkiola

2019

Weld World

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“…When this is the case, the production times are greatly lengthened, and the time spent waiting in between of the weld passes is significant and it increases the production costs significantly. [1][2][3] The requirement of having to control the heat input can be achieved by using more advanced welding technologies such as laser welding, laser-hybrid, pulsed gas metal arc welding (GMAW-P) and cold metal transfer (CMT). However, basic arc welding methods such as gas metal arc welding (GMAW) is the welding method that is usually used in the industry due the equipment being cheap to obtain and the seam tolerances being less restrictive to those of laser based welding technologies.…”

Section: Introductionmentioning

confidence: 99%

Effect of forced cooling after welding on CGHAZ mechanical properties of a martensitic steel

2018

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The effects of forced cooling, meaning forced cooling rate and forced cooling finish temperature, on the tensile and impact toughness properties of simulated weld coarse-grained heat affected zones have been studied for a commercial grade martensitic steel with a yield strength of 960 MPa. The simulations were done by using a Gleeble 3800 to give forced cooling finish temperatures of 500, 400, 300, 200 and 100 °C and forced cooling rates of 50 and 15 °C/s. For the steel studied, strength significantly increased with no significant negative effects on impact toughness when the steel was cooled rapidly to 200 or 100 °C at 15 °C/s. The results indicate that it may be possible to improve welding productivity and mechanical properties of the steel by using forced cooling down to 100 ∘ C to reduce waiting time between weld passes.

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“…Tube specimens were externally welded to the corners of plates using gas tungsten arc welding (GTAW). More information regarding the mechanical properties of steel materials, welding and fabrication procedures can be found in reference [26]. To compare the performance of these fabricated sections with conventional structural sections, a control test was conducted on an equivalent fabricated MS box section with a similar section width and cross-sectional area and therefore similar weight.…”

Section: Experimental Planmentioning

confidence: 99%

12.22: Seismic performance of high capacity hybrid beam‐columns: Comprising of high strength steel tubes subjected to lateral cyclic loading

et al. 2017

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High strength and ultra-high strength materials are widely used in industrial applications significantly increasing the load bearing capacity and reducing the overall weight and cost. The present study continues a series of experimental investigations on innovative fabricated hybrid sections consisting of high strength steel tubes welded to mild steel plates. This type of innovative section is proposed with the aim of promoting the application of high and ultra-high tensile steel in construction, taking advantage of the load-bearing capacity of these materials along with the coupled effect of ductile mild steel plates. Large-scale hybrid columns are tested under a combination of axial load and lateral cyclic load using a multi-axis substructure testing (MAST) facility. Lateral cyclic loadings are applied along with constant axial loads of which the hysteretic curves are obtained for various grades of steel tubes, namely, mild steel tube (grade 300), high strength steel tube (grade 800) and ultra-high strength steel tube (grade1200). Test results are analysed to examine the seismic performance of these proposed innovative sections and obtain the combined axial and lateral cyclic capacities, drifts, strains and plastic hinge distributions along the beam-columns. The effect of tube material is considered and the axial shortening observations are compared to constant compression. The experimental outcomes of this paper can be incorporated in nonlinear modelling of structures consisting of ultra-high strength steel tubes.

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Effect of weld on the mechanical properties of high strength and ultra-high strength steel tubes in fabricated hybrid sections

Cited by 70 publications

References 41 publications

Effect of enhanced cooling on mechanical properties of a multipass welded martensitic steel

Effect of enhanced cooling on mechanical properties of a multipass welded martensitic steel

Effect of forced cooling after welding on CGHAZ mechanical properties of a martensitic steel

12.22: Seismic performance of high capacity hybrid beam‐columns: Comprising of high strength steel tubes subjected to lateral cyclic loading

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