Author: P. C. Hughes
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
A series of multi-run submerged arc welds produced with conventional commercial wires and fluxes was evaluated by Charpy V notch and COD tests. Ductile fracture energy is raised and transition temperature lowered by increasing the weld metal Mn/Si ratio to about 2. The COD transition temperature increases with increasing weld metal yield strength. The strain rate sensitivity of the welds, as indicated by the rise in COD transition temperature on testing at a dynamic rather than quasi-static loading rate, increases as weld metal strength decreases. No controlling influence of as-deposited microstructure on fracture toughness was evident in the range of weld metals examined. (Author).
Fracture Toughness of Multi-Run Submerged Arc Welds
Author: P. C. Hughes
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
A series of multi-run submerged arc welds produced with conventional commercial wires and fluxes was evaluated by Charpy V notch and COD tests. Ductile fracture energy is raised and transition temperature lowered by increasing the weld metal Mn/Si ratio to about 2. The COD transition temperature increases with increasing weld metal yield strength. The strain rate sensitivity of the welds, as indicated by the rise in COD transition temperature on testing at a dynamic rather than quasi-static loading rate, increases as weld metal strength decreases. No controlling influence of as-deposited microstructure on fracture toughness was evident in the range of weld metals examined. (Author).
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Book Description
A series of multi-run submerged arc welds produced with conventional commercial wires and fluxes was evaluated by Charpy V notch and COD tests. Ductile fracture energy is raised and transition temperature lowered by increasing the weld metal Mn/Si ratio to about 2. The COD transition temperature increases with increasing weld metal yield strength. The strain rate sensitivity of the welds, as indicated by the rise in COD transition temperature on testing at a dynamic rather than quasi-static loading rate, increases as weld metal strength decreases. No controlling influence of as-deposited microstructure on fracture toughness was evident in the range of weld metals examined. (Author).
Effects of Microstructure on Fracture Toughness in A533B Submerged-arc Welds
Fracture-Toughness Evaluation in Submerged Arc-Welding Seam Welds in Nonstandard Curved SE(B) Specimens in the Short Radial Direction of API 5L Steel Pipe
Author: D. Angeles-Herrera
Publisher:
ISBN:
Category : API 5L steel pipe
Languages : en
Pages : 4
Book Description
Plane-strain fracture toughness of submerged arc-welding seams of an API 5L steel pipe in the short radial direction was evaluated using nonstandard curved SE(B) test specimens. These specimens are directly cut from the pipe and require no machining other than the crack starter notch. The stress intensity factor function for the nonstandard curved SE(B) specimen was calibrated for three-point bending loading. The initiating notch was aligned to make the crack propagate through the weld-deposited metal zone. The measured fracture-toughness value was 56.3 ± 2.9 Mpa?m. A fractographic study of the tested specimens showed that the deposited metal fracture consists of a mixture of ductile tearing and cleavage that corresponds to the ferrite and the dendritic grains, respectively. The dendritic grains behave in a brittle way, thus being the main contributions to the relatively low fracture-toughness values obtained from the tests.
Publisher:
ISBN:
Category : API 5L steel pipe
Languages : en
Pages : 4
Book Description
Plane-strain fracture toughness of submerged arc-welding seams of an API 5L steel pipe in the short radial direction was evaluated using nonstandard curved SE(B) test specimens. These specimens are directly cut from the pipe and require no machining other than the crack starter notch. The stress intensity factor function for the nonstandard curved SE(B) specimen was calibrated for three-point bending loading. The initiating notch was aligned to make the crack propagate through the weld-deposited metal zone. The measured fracture-toughness value was 56.3 ± 2.9 Mpa?m. A fractographic study of the tested specimens showed that the deposited metal fracture consists of a mixture of ductile tearing and cleavage that corresponds to the ferrite and the dendritic grains, respectively. The dendritic grains behave in a brittle way, thus being the main contributions to the relatively low fracture-toughness values obtained from the tests.
Potential for Low Fracture Toughness and Lamellar Tearing on PWR Steam Generator and Reactor Coolant Pump Supports
Author: U.S. Nuclear Regulatory Commission. Division of Operating Reactors
Publisher:
ISBN:
Category : Nuclear reactors
Languages : en
Pages : 270
Book Description
Publisher:
ISBN:
Category : Nuclear reactors
Languages : en
Pages : 270
Book Description
Effect of Notch Orientation on Fracture Toughness of a Submerged Arc Weld
Author: Muhammad Ali
Publisher:
ISBN:
Category : Fracture toughness
Languages : en
Pages : 15
Book Description
This paper reports the effect of notch orientation on the fracture toughness of a submerged arc weld as determined by performing standard fracture mechanics tests using single edge notched bend specimens having through-thickness and surface notches. The notch orientations used were NP (through-thickness notch at weld centerline running parallel to the weld direction), NQ (surface notch at weld centerline with the notch plane parallel to the weld but running perpendicular to the weld direction from the cap toward the root), and PQ (a surface notch where the notch plane is transverse to the weld and propagating from the cap toward the root). Testing was carried out over a range of temperatures. It was found that the NP notch orientation led to less scatter in fracture toughness, and the greatest amount of scatter was shown for NQ and PQ notch orientations. The test data for each notch orientation were used to determine the reference temperature T0 using ASTM E1921-13 and FITNET procedures. Values of T0 were subsequently used to define the temperature-versus-toughness transition curve (master curve) for each notch orientation. The fracture toughness predicted by the master curve analyses showed differences among the three notch orientations. As the FITNET procedure is more conservative for highly scattered data than the ASTM procedure, the predicted fracture toughness for the PQ and NQ notch orientations was significantly less than that for the NP notch orientation.
Publisher:
ISBN:
Category : Fracture toughness
Languages : en
Pages : 15
Book Description
This paper reports the effect of notch orientation on the fracture toughness of a submerged arc weld as determined by performing standard fracture mechanics tests using single edge notched bend specimens having through-thickness and surface notches. The notch orientations used were NP (through-thickness notch at weld centerline running parallel to the weld direction), NQ (surface notch at weld centerline with the notch plane parallel to the weld but running perpendicular to the weld direction from the cap toward the root), and PQ (a surface notch where the notch plane is transverse to the weld and propagating from the cap toward the root). Testing was carried out over a range of temperatures. It was found that the NP notch orientation led to less scatter in fracture toughness, and the greatest amount of scatter was shown for NQ and PQ notch orientations. The test data for each notch orientation were used to determine the reference temperature T0 using ASTM E1921-13 and FITNET procedures. Values of T0 were subsequently used to define the temperature-versus-toughness transition curve (master curve) for each notch orientation. The fracture toughness predicted by the master curve analyses showed differences among the three notch orientations. As the FITNET procedure is more conservative for highly scattered data than the ASTM procedure, the predicted fracture toughness for the PQ and NQ notch orientations was significantly less than that for the NP notch orientation.
Fracture Toughness, Tearing Resistance and Specimen Size Effects in Submerged Arc and Manual Metal Arc Welds in A533B Plate
Fracture Toughness of Submerged Arc Welded HY - 80 Steel
Author: Bryan Paul Wilson
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 210
Book Description
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 210
Book Description
Fracture Toughness of Manual Metal-Arc and Submerged-Arc Welded Joints in Normalized Carbon-Manganese Steels
Author: JG. Blaue
Publisher:
ISBN:
Category : Fracture toughness
Languages : en
Pages : 28
Book Description
This paper shows that, in the temperature transition regime, scatter of weld metal and heat-affected zone toughness values is related to material heterogeneity in the welded joints. Results were obtained from impact testing of V-notched and fatigue-cracked Charpy specimens as well as from static fracture toughness tests on small-scale and full-thickness specimens. Besides material heterogeneity, mechanical heterogeneity is emphasized as having a significant influence on the fracture performance of heat-affected zone specimens.
Publisher:
ISBN:
Category : Fracture toughness
Languages : en
Pages : 28
Book Description
This paper shows that, in the temperature transition regime, scatter of weld metal and heat-affected zone toughness values is related to material heterogeneity in the welded joints. Results were obtained from impact testing of V-notched and fatigue-cracked Charpy specimens as well as from static fracture toughness tests on small-scale and full-thickness specimens. Besides material heterogeneity, mechanical heterogeneity is emphasized as having a significant influence on the fracture performance of heat-affected zone specimens.
Influence of Flux Type on the Strength and Fracture Toughness of Mild Steel Weld Metal. Part 2: Multipass Welds
Author: N. Bailey
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Tests to examine the influence of the flux on the strength and toughness of multipass submerged arc welds in 30mm thick mild steel have been made with a range of fluxes and an arc energy of 3kJ/mm.
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Tests to examine the influence of the flux on the strength and toughness of multipass submerged arc welds in 30mm thick mild steel have been made with a range of fluxes and an arc energy of 3kJ/mm.