Effect of interpass temperature on the microstructure and mechanical properties of multi-pass weld metal in a 550-MPa-grade offshore engineering steel

Wang, X. L.; Tsai, Yu-Ting; Yang, Jer−Ren; Wang, Z. Q.; Li, X. C.; Chen, Shang; Misra, R.D.K.

doi:10.1007/s40194-017-0498-x

Cited by 43 publications

(15 citation statements)

References 27 publications

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“…The lower the interpass temperature the higher the allowed heat input will be for the next weld pass, which, depending on the material thickness, can influence the number of weld passes required. Previously, it has been shown that in the case of a high-strength steel with a tensile strength of 550 MPa, an interpass temperature of around 130°C caused the steel to have optimal mechanical properties [13]. Furthermore, in other study, it was shown that an interpass temperature of around 80°C produced superior tensile properties compared to higher interpass temperatures [14].…”

Section: Introductionmentioning

confidence: 95%

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: 95%

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

Laitila

Larkiola

2019

Weld World

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“…For example, some ultrahigh-strength steels require the use of three weld passes or more when the material thickness is equal to or exceeds 6 mm. [8][9][10][11][12] Therefore, in the production of structures from high-and ultrahigh-strength steels, it would be beneficial to use external forced cooling to minimize the waiting time between weld passes. Forced cooling is particularly beneficial in shortening the cooling time from 500 °C to 100 ∘ C since lower the temperature of the steel is, slower the cooling rate becomes.…”

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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“…Dornelas et al [12] observed that the increase in the IT signi cantly changed in the microstructure, and consequently decreased the CGHAZ hardness and fracture toughness of a Cr-Mo low-alloy steel. On the other hand, Wang et al [13] reported an improvement in the HAZ toughness due to an increase in IT between 80°C and 130°C; however, a drop was observed when the IT increased beyond 130°C. Therefore, the use of a higher IT seems to be critical in alloys sensitive to the cooling rate, justifying its control to ensure good fracture toughness.…”

Section: Introductionmentioning

confidence: 96%

Effect of the Interpass Temperature on Simulated Heat-Affected Zone of Gas Metal Arc Welded API 5L X70 Pipe Joint

Dornelas

Filho

Oliveira

et al. 2021

Preprint

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Welding costs associated with the laying of pipes for deepwater oil and gas extraction can be reduced using high interpass temperatures (ITs). However, a high IT can decrease the mechanical properties of the heat-affected zone (HAZ) of welded joints. With the use of high strength-toughness stees, this decrease may be an acceptable trade-off. Therefore, it is necessary to evaluate the influence of high ITs on the HAZ. The influence of the IT on the coarse grain HAZ (CGHAZ) and intercritically reheated coarse-grain HAZ (ICCGHAZ) of an API 5L X70 pipe joint welded by gas metal arc welding was investigated. The welding was numerically simulated using finite element method software. The microstructure of the HAZ was predicted using thermodynamic simulation software. The CGHAZ and ICCGHAZ were also physically simulated and evaluated via optical microscopy and scanning electron microscopy, dilatometry, and Vickers microhardness and Charpy V-notch (CVN) impact tests. The increase in IT led to a decrease in CGHAZ microhardness, but did not affect the ICCGHAZ. The CVN energies obtained for all ITs (CGHAZ and ICCGHAZ) were higher than that set by the DNVGL-ST-F101 standard (50 J). These results show that increasing the IT is an interesting and effective method to reduce welding costs. In addition, thermodynamic simulation proved to be a valid method for predicting the phases in the HAZ of API 5L X70 pipe welded joints.

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Effect of interpass temperature on the microstructure and mechanical properties of multi-pass weld metal in a 550-MPa-grade offshore engineering steel

Cited by 43 publications

References 27 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

Effect of the Interpass Temperature on Simulated Heat-Affected Zone of Gas Metal Arc Welded API 5L X70 Pipe Joint

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