Influence of Weld Heat Input on the Fracture and Metallurgy of HSLA-65

Bayley, Christopher; Mantei, A.

doi:10.1179/cmq.2009.48.3.311

Cited by 18 publications

(10 citation statements)

References 5 publications

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“…Conventional arc welding are the main welding technique applied in industry to join the high strength steels. However, these traditional arc welding procedures have relatively high heat inputs which result in slow cooling rates of the weldment, and this can produce softening in the heat affected zone (HAZ) [10], giving low strength of the weldment [11,12].…”

Section: Introductionmentioning

confidence: 99%

Comparison of microstructure and mechanical properties of ultra-narrow gap laser and gas-metal-arc welded S960 high strength steel

Guo

Dong³

et al. 2017

Optics and Lasers in Engineering

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The microstructural characteristics and mechanical properties, including micro-hardness, tensile properties, three-point bending properties and Charpy impact toughness at different test temperatures of 8 mm thick S960 high strength steel plates were investigated following their joining by multi-pass ultra-narrow gap laser welding (NGLW) and gas metal arc welding (GMAW) techniques. It was found that the microstructure in the fusion zone (FZ) for the ultra-NGLW joint was predominantly martensite mixed with some tempered martensite, while the FZ for the GMAW joint was mainly consisted of ferrite with some martensite. The strength of the ultra-NGLW specimens was comparable to that of the base material (BM), with all welded specimens failed in the BM in the tensile tests. The tensile strength of the GMAW specimens was reduced approximately by 100 MPa when compared with the base material by a broad and soft heat affected zone (HAZ) with failure located in the soft HAZ. Both the ultra-NGLW and GMAW specimens performed well in three-point bending tests. The GMAW joints exhibited better impact toughness than the ultra-NGLW joints.

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Section: Introductionmentioning

confidence: 99%

Comparison of microstructure and mechanical properties of ultra-narrow gap laser and gas-metal-arc welded S960 high strength steel

Guo

Dong³

et al. 2017

Optics and Lasers in Engineering

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“…Multiple authors have reported that heat input (HI) can be used to control the HAZ microstructure and properties [24][25][26][27]. Shimamura et al showed that HAZ toughness increased by forming lower bainite at low HI [28].…”

Section: Introductionmentioning

confidence: 99%

Study on the fracture toughness of friction stir welded API X80

Tribe¹,

Nelson

2015

Engineering Fracture Mechanics

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Study on the Fracture Toughness of Friction Stir Welded API X80 Allan Tribe Department of Mechanical Engineering, BYU Master of Science High strength low alloy (HSLA) steels have been developed to simultaneously have high yield strength and high fracture toughness. However, in practical applications steel must be welded. Traditional arc welding has proven detrimental to the fracture toughness of HSLA steels. Friction stir welding has recently shown mixed results in welding HSLA steels. The range of welding parameters used in these recent studies however has been very limited. With only a few welding parameters tested, the effect of spindle speed, travel speed, and heat input on the fracture toughness of friction stir welded HSLA steel remains unknown. To understand how the friction stir welding process parameters affect fracture toughness, double sided welds in API X80 were performed and analyzed. Results show that at room temperature friction stir welded API X80 exceeded industry minimum fracture toughness requirements in both the API Standard 1104 and DNV-OS-F101 by 143% and 62%, respectively. The process parameters of spindle speed and HI have been shown to effectively control the fracture toughness of the stir zone. Relationships have been established that show that fracture toughness increased by 85% when spindle speed decreased by 59% and heat input decreased by 46%.

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“…In the second container (2), the nanoparticle LaB 6 is deposited on the wire by electrolytic process with a nickel electrode as the cathode, the Union X96 welding wire as the anode, and a water-based electrolytic solution with 50% of Ni(BF 4 ) 2 *6H 2 O, 4% H 3 BO 3 , and 5% LaB 6 . To maintain the temperature at 70°C and for homogeneous distribution of LaB 6 nanoparticles in the solution, a mixer (11) and heater (7) are placed in the container (2). The last container consists of distilled water to cool down the coated wire.…”

Section: Welding Wirementioning

confidence: 99%

“…The microstructures and the lack of temper of the steels cause deep and wide softening of the HAZ region while welding, which leads to a reduction in hardness in the coarse-grained heat affect zone (CGHAZ) [27,43,44]. In addition, if high heat input is used, as in the GMAW process, a slow cooling rate results, leading to increased softening in the HAZ region and reduced joint strength [11,45].…”

Section: Microstructuresmentioning

confidence: 99%

“…Traditional GMAW results in a reduction in the mechanical properties of the weld relative to the base metal due to the high heat input. For instance, the high heat input of traditional GMAW processes leads to an increase in the cooling rate and, therefore, softening of the heat-affected zone and lower joint strength [7,11]. Research has shown that HSS welded by GMAW has significantly reduced mechanical properties in the joint than HSS welded with laser and other welding processes [12].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High-strength steel S960QC welded with rare earth nanoparticle coated filler wire

Vimalraj

Kah

Layus

et al. 2018

Int J Adv Manuf Technol

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High-strength steel S960 is one of a number of advanced steels able to meet the demands of the shipbuilding, offshore, and construction industries for a favorable good high strength/weight ratio. Gas metal arc welding (GMAW) is commonly used in all structural steel fabrication, and developments in GMAW have removed previous limitations regarding high heat input and have reduced flaws. One solution for controlled heat input while ensuring a stable arc is alloying the welding wire. Usage of nanoparticles as an alloying element in welding wire have shown significant improvements in weld properties. This study investigates an S960QC joint welded with a welding wire having Lanthanum (La) nanoparticles as a coating and examines the influence of La on the welding parameters, arc stability, microstructure formation, and mechanical properties. The results are compared with a weld formed with conventional Union X96 welding wire. The microstructures observed in the weld region were martensite and tempered martensite for both wires. In the heat-affected zone, microstructures of upper bainite, martensite, tempered martensite, and globular bainite were found. The La nanoparticle-coated wire provided a stable arc during welding. However, due to the increase in wire thickness, manual wire feeding was required. The impact toughness was lower in the joint formed with the nanoparticle-coated wire. Additionally, the hardness at the fusion region was higher in the joint welded with the nanoparticle-coated wire.

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Influence of Weld Heat Input on the Fracture and Metallurgy of HSLA-65

Cited by 18 publications

References 5 publications

Comparison of microstructure and mechanical properties of ultra-narrow gap laser and gas-metal-arc welded S960 high strength steel

Comparison of microstructure and mechanical properties of ultra-narrow gap laser and gas-metal-arc welded S960 high strength steel

Study on the fracture toughness of friction stir welded API X80

High-strength steel S960QC welded with rare earth nanoparticle coated filler wire

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