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Welding Fluxes for GTAW

effect the surface tension of the weld pool molecules andallow improved penetration on certain metals.

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Preparing Aluminum for Welding

positively charged gas ions are attracted to the negative workpiece.

chip away at the brittle oxide much like a miniature sandblastingoperation.

The electron flow from the work to the electrode lifts theloosened oxide leaving clean base metal to be welded.

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Preparing Stainless Steel for Welding

Filler material used should be compatible

heat conductivity of chrome-nickel stainless steels are about50% less than mild steel-tendency for distortion on thin sections.

carbide precipitation !00 " #$00 F&

. 'apid cooling through this range will help keep precipitation

to a minimum.

columbium or titanium are added to avoid the precipitation

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(ase study

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(ase study #)

*aulo +. ,odenesi usta/uio '. 1polina/rio 2aci ,. *ereira 3T24welding with single-component Fluxes +ournal of ,aterials*rocessing Technology 66 7000& 780-785.

activated flux TIG (ATIG) welding process

thin layer of an active flux that results in a great increase in

weld penetration

This effect is, generally, connected to the capture of electronsin the outer parts of the arc by elements of high

electronegativity, which constrict the arccausing an effect

similar to that used in plasma arc welding.

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TIG welding of stainless steels

to !oints of a maximum thic"ness of # mm and torelatively low welding speed.

from the literature indicate that !oints with a thic"ness of

$ mm, or even of %& mm, can be welded in a single passwith the ATIG process.

increase the anode current density and the arc force acting on the

welding pool ' similarly to what happens in plasma arc welding.

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