RE: [MW:18780] using of second welder while welding SS material

dear sir,

yeah it can be called DOT as per discription but client was refering as twin tig.

materials : duplex 31803
thk: 10mm
condition : plate
filler: ER2209

with single bevel earlier we were facing high ferrite n immense distotion.then design changed to double bevel and client suggested twin tig which was involving two welder one in top 1G Position and Other down 4G position both were provided shielding gas(under wind sheild).both were progressing very pricise n sycronised manners.

heat input was maintained through out between 0,65 to 1,98kj/mm

ferrite % required 30 90 and achieved 30 to 55 max 60.

distortion under minimum.acceptable level.

hope these will help.

regards,
mohd.

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