Mechanical properties of SMA- and SA-welded joints for quenched and tempered high-strength steel N-A-XTRA 70

Martti Vilpas, Hannele Tihekari, Risto Karppi

Research output: Book/ReportReport

Abstract

The report gives the test results of mechanical properties of shielded metal arc (SMAW) and submerged arc (SAW) welded joints for quenched and tempered high-strength steel N-A-XTRA 70 (StE 690). The testing procedure comprised conventional hardness, tensile and Charpy-V testing and fracture mechanics. The test results of the joints welded with Ni-Cr-Mo alloyed filler materials (SMAW: E 11018-M, SAW: S3NiCrMo2.5), using arc energies of 17 kJ/cm and 30 kJ/cm and preheat temperature of 170 °C showed that the weld metal strength and toughness properties were close to the base material values. The hardness was found to vary in the range of 278 - 337 HV5 for the weld metals and 295 - 476 HV5 for the heat affected zones of the joints. The hardness values were the highest (max. 476 HV5) close to the top areas of the heat affected zones welded with SMAW. The corresponding measurements from the SAW-joints gave somewhat lower hardness levels (max. 394 ElV5). The weld metals showed reasonably good Charpy-V transition behaviour as compared with the base material. The transition of toughness properties for the fusion boundaries was, however, located at markedly higher temperatures than that of the base material. The results indicate that the arc energy should be kept low (i.e. around 17 kJ/cm) for reasonable impact properties at fusion boundaries of the steel N-A-XTRA 70. In this respect, SAW turned out to be a more favourable welding procedure than SMAW. The fracture toughness testing of the joints showed that the arc energy had no marked effect on the K J-transition behaviour of the weld metals. The testing of the fusion boundaries, however, revealed again that the arc energy should be restricted around 17 kJ/cm to achieve good fracture toughness at fusion boundaries of the steel N-A-XTRA 70. This was found to be the case especially at the lower test temperatures.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages26
ISBN (Print)951-38-2402-0
Publication statusPublished - 1985
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports
Number363
ISSN0358-5077

Fingerprint

High strength steel
Welds
Mechanical properties
Fusion reactions
Hardness
Metals
Testing
Heat affected zone
Toughness
Fracture toughness
Steel
Fracture mechanics
Temperature
Fillers
Welding

Keywords

  • welded joints
  • mechanical properties
  • high strength steels

Cite this

Vilpas, M., Tihekari, H., & Karppi, R. (1985). Mechanical properties of SMA- and SA-welded joints for quenched and tempered high-strength steel N-A-XTRA 70. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 363
Vilpas, Martti ; Tihekari, Hannele ; Karppi, Risto. / Mechanical properties of SMA- and SA-welded joints for quenched and tempered high-strength steel N-A-XTRA 70. Espoo : VTT Technical Research Centre of Finland, 1985. 26 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 363).
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Vilpas, M, Tihekari, H & Karppi, R 1985, Mechanical properties of SMA- and SA-welded joints for quenched and tempered high-strength steel N-A-XTRA 70. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 363, VTT Technical Research Centre of Finland, Espoo.

Mechanical properties of SMA- and SA-welded joints for quenched and tempered high-strength steel N-A-XTRA 70. / Vilpas, Martti; Tihekari, Hannele; Karppi, Risto.

Espoo : VTT Technical Research Centre of Finland, 1985. 26 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 363).

Research output: Book/ReportReport

TY - BOOK

T1 - Mechanical properties of SMA- and SA-welded joints for quenched and tempered high-strength steel N-A-XTRA 70

AU - Vilpas, Martti

AU - Tihekari, Hannele

AU - Karppi, Risto

PY - 1985

Y1 - 1985

N2 - The report gives the test results of mechanical properties of shielded metal arc (SMAW) and submerged arc (SAW) welded joints for quenched and tempered high-strength steel N-A-XTRA 70 (StE 690). The testing procedure comprised conventional hardness, tensile and Charpy-V testing and fracture mechanics. The test results of the joints welded with Ni-Cr-Mo alloyed filler materials (SMAW: E 11018-M, SAW: S3NiCrMo2.5), using arc energies of 17 kJ/cm and 30 kJ/cm and preheat temperature of 170 °C showed that the weld metal strength and toughness properties were close to the base material values. The hardness was found to vary in the range of 278 - 337 HV5 for the weld metals and 295 - 476 HV5 for the heat affected zones of the joints. The hardness values were the highest (max. 476 HV5) close to the top areas of the heat affected zones welded with SMAW. The corresponding measurements from the SAW-joints gave somewhat lower hardness levels (max. 394 ElV5). The weld metals showed reasonably good Charpy-V transition behaviour as compared with the base material. The transition of toughness properties for the fusion boundaries was, however, located at markedly higher temperatures than that of the base material. The results indicate that the arc energy should be kept low (i.e. around 17 kJ/cm) for reasonable impact properties at fusion boundaries of the steel N-A-XTRA 70. In this respect, SAW turned out to be a more favourable welding procedure than SMAW. The fracture toughness testing of the joints showed that the arc energy had no marked effect on the K J-transition behaviour of the weld metals. The testing of the fusion boundaries, however, revealed again that the arc energy should be restricted around 17 kJ/cm to achieve good fracture toughness at fusion boundaries of the steel N-A-XTRA 70. This was found to be the case especially at the lower test temperatures.

AB - The report gives the test results of mechanical properties of shielded metal arc (SMAW) and submerged arc (SAW) welded joints for quenched and tempered high-strength steel N-A-XTRA 70 (StE 690). The testing procedure comprised conventional hardness, tensile and Charpy-V testing and fracture mechanics. The test results of the joints welded with Ni-Cr-Mo alloyed filler materials (SMAW: E 11018-M, SAW: S3NiCrMo2.5), using arc energies of 17 kJ/cm and 30 kJ/cm and preheat temperature of 170 °C showed that the weld metal strength and toughness properties were close to the base material values. The hardness was found to vary in the range of 278 - 337 HV5 for the weld metals and 295 - 476 HV5 for the heat affected zones of the joints. The hardness values were the highest (max. 476 HV5) close to the top areas of the heat affected zones welded with SMAW. The corresponding measurements from the SAW-joints gave somewhat lower hardness levels (max. 394 ElV5). The weld metals showed reasonably good Charpy-V transition behaviour as compared with the base material. The transition of toughness properties for the fusion boundaries was, however, located at markedly higher temperatures than that of the base material. The results indicate that the arc energy should be kept low (i.e. around 17 kJ/cm) for reasonable impact properties at fusion boundaries of the steel N-A-XTRA 70. In this respect, SAW turned out to be a more favourable welding procedure than SMAW. The fracture toughness testing of the joints showed that the arc energy had no marked effect on the K J-transition behaviour of the weld metals. The testing of the fusion boundaries, however, revealed again that the arc energy should be restricted around 17 kJ/cm to achieve good fracture toughness at fusion boundaries of the steel N-A-XTRA 70. This was found to be the case especially at the lower test temperatures.

KW - welded joints

KW - mechanical properties

KW - high strength steels

M3 - Report

SN - 951-38-2402-0

T3 - Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports

BT - Mechanical properties of SMA- and SA-welded joints for quenched and tempered high-strength steel N-A-XTRA 70

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Vilpas M, Tihekari H, Karppi R. Mechanical properties of SMA- and SA-welded joints for quenched and tempered high-strength steel N-A-XTRA 70. Espoo: VTT Technical Research Centre of Finland, 1985. 26 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 363).