Analysis of Welding Stress by Finite Element Methnd and Mechenism of Prnductinn of Residual Stresses

Ueda, Y.; Fukuda, Keiji; Nakacho, Keiji

doi:10.2207/qjjws1943.45.29

Cited by 11 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is assessed due to a shrinkage in the direction of the plate thickness after the welding, in which during the cooling process after the weld, compressed stress was induced in the vicinity of the weld joint center of the outer surface in the case of multi-layer welding. 13,16) Also the obtained readings for the tendency in the distribution of the residual stresses are assessed as being similar to the actual measurement and calculation results, conducted for multi-layer welding of a 50 mm thick plate and 30.9 mm thick pipe (609.6 mm in outer diameter), respectively. 17,18) Therefore, the measured distributions of residual stresses are assessed to agree with the standard thermal stress generated in multi-layer welding of very thick plate.…”

Section: Residual Stresses (1) Generation and Distribution Of Residuamentioning

confidence: 77%

Long-Term Integrity of Waste Package Final Closure for HLW Geological Disposal, (II) Applicability of TIG Welding Method to Overpack Final Closure

Asano¹,

Sawa

Aritomi

2005

J. Nucl. Sci. Technol.

View full text Add to dashboard Cite

Overpack, a high-level radioactive waste package for geological disposal, seals vitrified waste and in line with Japan's waste management program is required to isolate it from contact with groundwater for 1,000 years. In this study, TIG (Tungsten Inert Gas) welding method, a typical arc welding method and widely used in various industries, was examined for its applicability to seal a carbon steel overpack lid with a thickness of 190 mm. Welding conditions and welding parameters were examined for multi-layer welding in a narrow gap for four different groove depths. Weld joint tests were conducted and weld flaws, macro-and microstructure, and mechanical properties were assessed within tentatively applied criteria for weld joints. Measurement and numerical calculation for residual stress were also conducted and the tendency of residual stress distribution was discussed. These test results were compared with the basic requirements of the welding method for overpack which were pointed out in our first report. It is assessed that the TIG welding method has the potential to provide the necessary requirements to complete the final closure of overpack with a maximum thickness of 190 mm.

show abstract

Section: Residual Stresses (1) Generation and Distribution Of Residuamentioning

confidence: 77%

Long-Term Integrity of Waste Package Final Closure for HLW Geological Disposal, (II) Applicability of TIG Welding Method to Overpack Final Closure

Asano¹,

Sawa

Aritomi

2005

J. Nucl. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…15,16) On the top surface, compressed stress was induced in the vicinity of the weld joint center due to shrinkage in the axis direction after welding. 15,17) The distribution patterns obtained are considered to be in agreement with typical multilayer welding for a thick plate.…”

Section: Residual Stressmentioning

confidence: 55%

Long-Term Integrity of Waste Package Final Closure for HLW Geological Disposal, (V) Applicability of MAG Welding Method to Overpack Final Closure

Asano¹,

Ito

2008

J. Nucl. Sci. Technol.

View full text Add to dashboard Cite

Overpack, a high-level radioactive waste package for Japan's geological disposal program, is required for preventing the sealed vitrified waste from contact with groundwater for 1,000 years. In this study, metal active gas (MAG) welding, a typical arc welding method, was evaluated for its applicability in sealing a carbon steel overpack lid with a thickness of 190 mm. Welding conditions and parameters were examined with multilayer welding for three different groove depths. Welded joint tests including the observation of macro-and microstructures were conducted, and mechanical properties were within tentatively applied criteria. Measurements and numerical calculations for residual stress were also conducted, and residual stress distribution tendencies were discussed. These test results were compared with those previously reported for tungsten inert gas welding (TIG) and electron beam welding (EBW). MAG welding possesses the potential to complete overpack lid closure with a maximum groove depth of 190 mm, but the applicability of MAG welding to overpack final closure should be discussed from the viewpoint of the presence of slag inclusions possibly induced in the weld metal.

show abstract

“…[1][2][3] This is mostly because the inherent strain, which governs welding residual stresses and distortion, is determined by two factors: the maximum temperature controlled by a welding heat input and the maximum temperature change at relatively lower temperatures (e.g. less than 500uC for steel) after a welding heat source has passed.…”

Section: Introductionmentioning

confidence: 99%

“…In the field of welding mechanics theoretically treating welding residual stresses and distortion, instantaneous heat source has been often used as welding heat source instead of moving source, based on the heat conduction analyses reported by Satoh. [1][2][3] This is mostly because the inherent strain, which governs welding residual stresses and distortion, is determined by two factors: the maximum temperature controlled by a welding heat input and the maximum temperature change at relatively lower temperatures (e.g. less than 500uC for steel) after a welding heat source has passed.…”

Section: Introductionmentioning

confidence: 99%

“…less than 500uC for steel) after a welding heat source has passed. 2 Friction stir welding (FSW) recently appeared as an efficient method for the welding of aluminium alloy. The maximum temperature in FSW process was not successfully estimated by the temperature rise calculated with instantaneous heat source because of the high thermal conductivity of aluminium alloys.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Applicable conditions of instantaneous source used for welding heat conduction

Terasaki¹,

Kitamura²,

Akiyama³

et al. 2005

Science and Technology of Welding and Joining

View full text Add to dashboard Cite

This paper deals with the sufficient conditions under which instantaneous heat source can be considered as welding heat source instead of moving source. Temperature rises calculated by instantaneous source and moving one were compared. The applicable conditions of the instantaneous heat source with errors of 1% and 5% were found. This enables us to select either moving or instantaneous source with information of welding speed, thermal diffusivity and the distance from the weld centre line to the interested location. Approximate equations to determine the maximum temperature rise using a moving source were proposed and the accuracy of their calculation was proved to be y99%.

show abstract

Analysis of Welding Stress by Finite Element Methnd and Mechenism of Prnductinn of Residual Stresses

Cited by 11 publications

References 0 publications

Long-Term Integrity of Waste Package Final Closure for HLW Geological Disposal, (II) Applicability of TIG Welding Method to Overpack Final Closure

Long-Term Integrity of Waste Package Final Closure for HLW Geological Disposal, (II) Applicability of TIG Welding Method to Overpack Final Closure

Long-Term Integrity of Waste Package Final Closure for HLW Geological Disposal, (V) Applicability of MAG Welding Method to Overpack Final Closure

Applicable conditions of instantaneous source used for welding heat conduction

Contact Info

Product

Resources

About