Flux cored, gas shielded welding electrode

A gas shielding and welding rod technology, applied in the field of arc welding, can solve problems such as high carbon content, low nickel content, and no magnesium

Inactive Publication Date: 2006-11-22
LINCOLN GLOBAL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of boron alloying agents is taught in Crockett 5,365,036; however, this flux cored electrode has a low nickel content, high carbon content and no magnesium, unlike the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0008] According to the invention, the sheath around the flux core has a carbon content of less than 0.05%, so that there is substantially a lower percentage of carbon in the resulting weld metal. Nickel in the weld metal is controlled in the usual range of 1.0-2.0%. The weld metal does not contain a wide range of nickel like some general purpose electrodes. The nickel comes entirely from the alloying agent in the electrode core. The electrode cores had the compositions shown in Table I.

[0009] composition

[0010] Preparation of the electrode results in a weld metal having a tensile strength greater than 100Kpsi and a yield strength greater than 80Kpsi. Furthermore, there is substantially less diffusible hydrogen in the resulting weld metal than that obtained with H8 grade electrodes. These advantages cannot be obtained by the prior art related to the present invention.

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Abstract

A flux cored, gas shielded arc welding electrode for depositing a weld metal with low diffusible hydrogen and having tensile strength greater than 620 N / mm 2 (90 Kpsi) and a yield strength greater than 550 N / mm 2 (80 Kpsi). The electrode includes a nickel free steel sheath with a carbon content of less than 0.05% of the sheath and a core in the range of 13-17% of the electrode wherein the core includes primary alloy particles of iron, manganese, magnesium and nickel with a minor amount of secondary alloy particles of a silicon alloy and a boron alloy in a rutile based slag system. The nickel has a controlled amount in the general range of 1.0-2.0% by weight of the electrode and the rutile is 40-60% by weight of the core.

Description

technical field [0001] This invention relates to the field of arc welding, and more particularly to a new and improved flux-cored gas shielded welding electrode for producing weld metals with ultra-high tensile strength. Background technique [0002] The present invention relates to a specific flux cored gas shielded welding electrode for depositing weld metal with low diffusible hydrogen and high tensile strength. The special combination of components in the flux core of the electrode contributes to these beneficial properties at substantially no added cost. As background information, Crockett 4,833,296 discloses a flux cored electrode that is self-shielding, contains a low percentage of manganese in the core and contains no magnesium. These limitations prevent the electrode from forming a weld metal of low diffusible hydrogen or ultrahigh tensile strength as contemplated by the use of the present invention. However, this self-shielding electrode, albeit a different type ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/22B23K9/16B23K35/362B23K35/368
CPCB23K35/3026B23K35/3033B23K35/368
Inventor 尼克希尔·卡罗高
Owner LINCOLN GLOBAL INC
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