No more thinking
 

Gerald I have followed your advise and a great job came out.
I was afraid at the beginning, but now looking back...piece of cake.

I wrote down the result in my threat. I don`t know how you want to handle this, but you can move it or copy it or cut it...here`s the result.

Thanks Gerald again for helping out.

How much weld current (Amps) did you use, and how far apart were your final welds?

Gerald,

I worked with an old triodine (I don`t know if this term is known). It`s a three phase dc welder from 1965.

Amperage 150 Ah. 4.5mm sticks

I started with 3 welds each 40 mm long followed by a large gap of about 70 cm. I wanted a smooth bending so I started with the first three welds on a distance of about 1.7 meters, from the end of the beam just passing a little bit over half.
After cooling another weld 2 cm apart from the first. Then cooling...

It looked like this. -- =welding .....=space

--...................--.....................-- cooling :(
-- --................-- --.................-- -- cooling :confused:
-- -- --.............-- -- --..............-- -- -- cooling :)
-- -- -- --..........-- -- -- --...........-- -- -- -- cooling :confused: aso
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- end of procedure:)

until it got a complete line wiyh 40mm welds and 20-30mm spaces.

I will take some pics and post them later.

Good night
Claus