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Ultra-high strength cryogenic weldments

A technology of welding parts and welding process, applied in the field of ultra-high-strength welding parts, which can solve problems such as unsuitable alloy steel

Inactive Publication Date: 2000-07-26
EXXON PROD RES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current industrial welding methods using commercially available consumable wires are not suitable for welding the high-strength low-alloy steels mentioned above, nor are they capable of producing weldments with properties required for low-temperature, pressurized industrial applications

Method used

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  • Ultra-high strength cryogenic weldments
  • Ultra-high strength cryogenic weldments
  • Ultra-high strength cryogenic weldments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] In a first embodiment of the method of the present invention, gas metal arc welding (GMAW) is used to obtain a weld metal chemical composition comprising iron and about 0.07 wt% carbon, about 2.05 wt% Manganese, about 0.32 wt% silicon, about 2.20 wt% nickel, about 0.45 wt% chromium, about 0.56 wt% molybdenum, less than about 110 ppm phosphorus, and less than about 50 ppm sulfur. A weld is formed on a steel, such as the base steel described above, using an argon-based shielding gas having an oxygen content of less than about 1 wt%. The welding heat input is about 0.3-1.5 kJ / mm (7.6-38 kJ / inch). The tensile strength of the weldment obtained by welding using the present method is greater than about 900 MPa (130 ksi), preferably greater than about 930 MPa (135 ksi), more preferably greater than about 965 MPa (140 ksi), and even more preferably at least about 1000 MPa (145 ksi). Additionally, the DBTT of the weld metal obtained by welding by the present method is less than ...

Embodiment 2

[0055]In another embodiment of the method of the present invention, the GMAW method is used to obtain a weld metal chemical composition comprising iron and about 0.10 wt% carbon (preferably less than about 0.10 wt% carbon, more preferably About 0.07~0.08wt% carbon), about 1.60wt% manganese, about 0.25wt% silicon, about 1.87wt% nickel, about 0.87wt% chromium, about 0.51wt% molybdenum, less than about 75ppm Phosphorus, and less than about 100 ppm sulfur. The welding heat input range is about 0.3-1.5 kJ / mm (7.6-38 kJ / inch), and the preheat temperature used is about 100°C (212°F). A weld is formed on a steel, such as the base steel described above, using an argon-based shielding gas having an oxygen content of less than about 1 wt%. The tensile strength of the weldment obtained by welding using the present method is greater than about 900 MPa (130 ksi), preferably greater than about 930 MPa (135 ksi), more preferably greater than about 965 MPa (140 ksi), and even more preferably ...

Embodiment 3

[0057] In yet another embodiment of the method of the present invention, tungsten inert gas welding (TIG) is used to obtain a weld metal chemical composition comprising iron and about 0.07 wt% carbon (preferably less than about 0.07wt% carbon), about 1.80wt% manganese, about 0.20wt% silicon, about 4.00wt% nickel, about 0.5wt% chromium, about 0.40wt% molybdenum, about 0.02wt% copper, about 0.02 wt% aluminum, about 0.010 wt% titanium, about 0.015 wt% Zr, less than about 50 ppm phosphorus, and less than about 30 ppm sulfur. The welding heat input range is about 0.3-1.5 kJ / mm (7.6-38 kJ / inch), and the preheat temperature used is about 100°C (212°F). A weld is formed on a steel, such as the base steel described above, using an argon-based shielding gas having an oxygen content of less than about 1 wt%. The tensile strength of the weldment obtained by welding using the present method is greater than about 900 MPa (130 ksi), preferably greater than about 930 MPa (135 ksi), more pref...

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Abstract

Provided is a welding method for connecting the ultra-high strength low alloy steels, in order to obtain weldments with a tensile strength greater than about 900 MPa (130ksi). The welding line metal on the said weldments has a fracture toughness suited to low-temperature applications based on the known the fracture mechanics principle.

Description

field of invention [0001] The present invention relates to a method of producing ultra high strength weldments having a weld metal with excellent low temperature fracture toughness. More specifically, the present invention relates to methods of producing ultra-high strength weldments on ultra-high-strength low-alloy steels to form weld metals having excellent low temperature fracture toughness. Background of the invention [0002] A number of terms are defined in the description that follows. For convenience, a glossary is given just before the claims. [0003] Frequently, it is desirable to store and transport pressurized volatile liquids at cryogenic temperatures, ie, temperatures below about -40°C (-40°F). For example, there is a need for containers to store and transport pressurized liquefied natural gas (PLNG) at pressures ranging from about 1035 kPa (150 psia) to 7590 kPa (1100 psia) and at temperatures above about -123°C (-190°F). There is also a need for container...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/173B23K35/30B60K15/03C22C38/00C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16F17C1/00F17C1/14F17C3/00F17C3/02F17C7/00F17C7/02F17C13/00F17D1/08F25B19/00F25D23/00F25J1/00F25J1/02F25J3/02
CPCB23K9/173B23K35/3066B60K15/03006C22C38/001C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16F17C1/00F17C1/002F17C1/14F17C3/00F17C3/025F17C7/02F17C13/001F17C2201/0109F17C2201/0128F17C2201/035F17C2201/054F17C2203/0648F17C2205/013F17C2205/0134F17C2205/0302F17C2205/0323F17C2209/221F17C2221/033F17C2221/035F17C2223/0153F17C2223/0161F17C2223/033F17C2223/035F17C2227/0135F17C2260/011F17C2260/012F17C2260/032F17C2260/036F17C2265/035F17C2265/05F17C2265/061F17C2270/0105F17C2270/0136F17C2270/05F17D1/082B23K9/16
Inventor D·P·法尔其尔德
Owner EXXON PROD RES CO
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