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Welding rod and method for reducing manganese from welding smoke

A technology of welding fume and welding rod, applied in welding equipment, welding medium, welding equipment, etc., can solve the problem of reducing the use of manganese

Inactive Publication Date: 2002-09-11
ILLINOIS TOOL WORKS INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has not been possible to date to significantly reduce the use of manganese in conventional electrodes and electrodes

Method used

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  • Welding rod and method for reducing manganese from welding smoke
  • Welding rod and method for reducing manganese from welding smoke
  • Welding rod and method for reducing manganese from welding smoke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The mixed particles are used in the mixture stirrer to put 4.7wt% manganese particles (average particle size is about 80 mesh), 33.4wt% Mn / Fe / Si alloy particles (average particle size is about 80 mesh) and 56.7wt% rutile TiO 2 Granules (average particle size approximately 80) were prepared by dry stirring for 10 minutes. After mixing, 5 parts sodium silicate (3 parts water, 2 parts silicate) was added and stirring continued until particles no larger than about 0.25 inches were obtained. The pellets were dried in an oven at 1260°F for 60 minutes. The mixed particles were mixed with conventional fillers for flux-cored electrodes to provide the filler mixtures in the weight percents of Table 5. The filling mixture is spread on a metal belt and formed into a tube surrounding the particles by drawing it through a series of drawing dies in a manner well known in the art. This electrode contains 15% filler.

[0038] The core, sheath and electrode compositions of this elect...

Embodiment 2

[0042] The effect of mixed particles on manganese levels in welding and welding fumes was investigated using the following electrodes.

[0043] Electrode 1: A commercially available flux-cored electrode having a class combination conforming to AWS E71T-1.

[0044] Electrode 2: Same composition as Electrode 1, except that manganese was incorporated into the mixed particles prepared from the CaO plus rutile mixture.

[0045] Electrode 3: An electrode similar to Electrode 2 with mixed particles of rutile and manganese, with less manganese in the core.

[0046] Electrode 4: Similar to Electrode 3, except that the CaO plus rutile mixture in Electrode 3 was replaced by rutile-containing MgO.

[0047] Electrode 5: Similar to Electrode 4 except containing less MgO-rutile.

[0048] Electrode 6: An electrode similar to electrode 2 with less manganese in the core.

[0049] Electrode 7: An electrode similar to electrode 6 with less magnesium in the core.

[0050] welding rod ...

Embodiment 3

[0055] A standard electrode (electrode #1) was modified in such a way that 25, 50, 75 and 100% of commercially available manganese and rutile were incorporated into the electrode core in the form of mixed particles. Using 75% Ar and 25% CO 2 Mixed gas used these electrodes for welding tests. Measuring the amount of manganese in welding fume. The results are listed in Table 8. The results showed that the amount of manganese in the welding fume was reduced by incorporating manganese into the mixed particles.

[0056] Electrode #1

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PUM

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Abstract

A cored electrode for arc welding, the electrode has a core, and the filler in the core includes mixed particles containing manganese.

Description

technical field [0001] This invention relates generally to welding and welding electrodes for joining and surface welding, and more particularly to flux-cored electrodes. Background technique [0002] Flux cored electrodes are widely used for arc welding of low carbon and low alloy steel base metals. In order to increase the productivity of component manufacturing, flux-cored electrodes are increasingly used as an alternative to solid electrodes. This electrode produces high-strength welds in single-pass and multi-pass welding operations at high welding speeds. Flux-cored electrodes are composite tubular filler metal electrodes that have a metal sheath and a core containing a mixture of powdered materials. The mixture of cores is about 1-45% of the total weight of the electrode. During the production of electrodes, the core mixture is stirred and spread onto a steel strip, which is formed into a tube or sheath surrounding the core mixture in a formin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K35/02B23K35/22B23K35/30B23K35/36B23K35/368
CPCB23K35/0266B23K35/30B23K35/3053B23K35/3608B23K35/368B23K35/22
Inventor 托马斯H·诺思洛厄尔W·莫特
Owner ILLINOIS TOOL WORKS INC