Mechanical properties of welded joints in two fine-grained steels with yield strength of 370 N/mm

Martti Vilpas, Albert Heuser, Helmut Nies, Risto Karppi

Research output: Book/ReportReportProfessional

Abstract

The report deals with the results of welding tests for two microalloyed steels (plate thickness 40 mm): normalised Raex 386 P Arctic (Nb-V) and controlled rolled RR St 52-3U (Ti-N). Both steels represent the yield strength level of 370 N/mm2. The welding tests were carried out using gas metal arc narrow gap, shielded metal arc, submerged arc and electroslag welding in the arc energy range from 8 to 425 kJ/cm. The test results showed that the most favourable joint toughness - even superior to that of the base material - could be obtained in narrow gap welding (8 kJ/cm). In conventional SMAW and SAW the arc energy had to be reduced below 30 kJ/cm to obtain the most favourable joint toughness. Also higher heat inputs of 40 - 50 kJ/cm were found possible to increase the productivity of SAW when Charpy-V notch 27 J transition temperature of -40...-50 °C is a sufficient requirement for the joints. The Ti-N steel RR St 52-3U allowed even somewhat higher arc energies to fulfill this toughness level. In high energy welding (ESW: 425 kJ/cm) the Ti-N steel yielded markedly more favourable HAZ transition behaviour (T27J = -25 °C) than did the Nb-V steel Raex 386 Arctic (T27J = +5 °C). The same type of difference was also found between Ti-B-microalloyed and conventional weld metals.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages37
ISBN (Print)951-38-2723-2
Publication statusPublished - 1986
MoE publication typeD4 Published development or research report or study

Publication series

NameTutkimuksia / Valtion teknillinen tutkimuskeskus
PublisherVTT
Volume441

Fingerprint

Yield stress
Welds
Welding
Mechanical properties
Steel
Toughness
Electroslag welding
Submerged arc welding
Metals
Superconducting transition temperature
Productivity

Keywords

  • high strength steels
  • welded joints
  • mechanical properties

Cite this

Vilpas, M., Heuser, A., Nies, H., & Karppi, R. (1986). Mechanical properties of welded joints in two fine-grained steels with yield strength of 370 N/mm. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 441
Vilpas, Martti ; Heuser, Albert ; Nies, Helmut ; Karppi, Risto. / Mechanical properties of welded joints in two fine-grained steels with yield strength of 370 N/mm. Espoo : VTT Technical Research Centre of Finland, 1986. 37 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 441).
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abstract = "The report deals with the results of welding tests for two microalloyed steels (plate thickness 40 mm): normalised Raex 386 P Arctic (Nb-V) and controlled rolled RR St 52-3U (Ti-N). Both steels represent the yield strength level of 370 N/mm2. The welding tests were carried out using gas metal arc narrow gap, shielded metal arc, submerged arc and electroslag welding in the arc energy range from 8 to 425 kJ/cm. The test results showed that the most favourable joint toughness - even superior to that of the base material - could be obtained in narrow gap welding (8 kJ/cm). In conventional SMAW and SAW the arc energy had to be reduced below 30 kJ/cm to obtain the most favourable joint toughness. Also higher heat inputs of 40 - 50 kJ/cm were found possible to increase the productivity of SAW when Charpy-V notch 27 J transition temperature of -40...-50 °C is a sufficient requirement for the joints. The Ti-N steel RR St 52-3U allowed even somewhat higher arc energies to fulfill this toughness level. In high energy welding (ESW: 425 kJ/cm) the Ti-N steel yielded markedly more favourable HAZ transition behaviour (T27J = -25 °C) than did the Nb-V steel Raex 386 Arctic (T27J = +5 °C). The same type of difference was also found between Ti-B-microalloyed and conventional weld metals.",
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Vilpas, M, Heuser, A, Nies, H & Karppi, R 1986, Mechanical properties of welded joints in two fine-grained steels with yield strength of 370 N/mm. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 441, VTT Technical Research Centre of Finland, Espoo.

Mechanical properties of welded joints in two fine-grained steels with yield strength of 370 N/mm. / Vilpas, Martti; Heuser, Albert; Nies, Helmut; Karppi, Risto.

Espoo : VTT Technical Research Centre of Finland, 1986. 37 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 441).

Research output: Book/ReportReportProfessional

TY - BOOK

T1 - Mechanical properties of welded joints in two fine-grained steels with yield strength of 370 N/mm

AU - Vilpas, Martti

AU - Heuser, Albert

AU - Nies, Helmut

AU - Karppi, Risto

PY - 1986

Y1 - 1986

N2 - The report deals with the results of welding tests for two microalloyed steels (plate thickness 40 mm): normalised Raex 386 P Arctic (Nb-V) and controlled rolled RR St 52-3U (Ti-N). Both steels represent the yield strength level of 370 N/mm2. The welding tests were carried out using gas metal arc narrow gap, shielded metal arc, submerged arc and electroslag welding in the arc energy range from 8 to 425 kJ/cm. The test results showed that the most favourable joint toughness - even superior to that of the base material - could be obtained in narrow gap welding (8 kJ/cm). In conventional SMAW and SAW the arc energy had to be reduced below 30 kJ/cm to obtain the most favourable joint toughness. Also higher heat inputs of 40 - 50 kJ/cm were found possible to increase the productivity of SAW when Charpy-V notch 27 J transition temperature of -40...-50 °C is a sufficient requirement for the joints. The Ti-N steel RR St 52-3U allowed even somewhat higher arc energies to fulfill this toughness level. In high energy welding (ESW: 425 kJ/cm) the Ti-N steel yielded markedly more favourable HAZ transition behaviour (T27J = -25 °C) than did the Nb-V steel Raex 386 Arctic (T27J = +5 °C). The same type of difference was also found between Ti-B-microalloyed and conventional weld metals.

AB - The report deals with the results of welding tests for two microalloyed steels (plate thickness 40 mm): normalised Raex 386 P Arctic (Nb-V) and controlled rolled RR St 52-3U (Ti-N). Both steels represent the yield strength level of 370 N/mm2. The welding tests were carried out using gas metal arc narrow gap, shielded metal arc, submerged arc and electroslag welding in the arc energy range from 8 to 425 kJ/cm. The test results showed that the most favourable joint toughness - even superior to that of the base material - could be obtained in narrow gap welding (8 kJ/cm). In conventional SMAW and SAW the arc energy had to be reduced below 30 kJ/cm to obtain the most favourable joint toughness. Also higher heat inputs of 40 - 50 kJ/cm were found possible to increase the productivity of SAW when Charpy-V notch 27 J transition temperature of -40...-50 °C is a sufficient requirement for the joints. The Ti-N steel RR St 52-3U allowed even somewhat higher arc energies to fulfill this toughness level. In high energy welding (ESW: 425 kJ/cm) the Ti-N steel yielded markedly more favourable HAZ transition behaviour (T27J = -25 °C) than did the Nb-V steel Raex 386 Arctic (T27J = +5 °C). The same type of difference was also found between Ti-B-microalloyed and conventional weld metals.

KW - high strength steels

KW - welded joints

KW - mechanical properties

M3 - Report

SN - 951-38-2723-2

T3 - Tutkimuksia / Valtion teknillinen tutkimuskeskus

BT - Mechanical properties of welded joints in two fine-grained steels with yield strength of 370 N/mm

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Vilpas M, Heuser A, Nies H, Karppi R. Mechanical properties of welded joints in two fine-grained steels with yield strength of 370 N/mm. Espoo: VTT Technical Research Centre of Finland, 1986. 37 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 441).