6013's Vs 7018's | MIG Welding Forum

Im just about set up now to have a bash at MMA. I have the Sherman Tig set which I'm more than happy with for Tig. So going to have a go at arc. I've got a lead and electrode holder and just got some electrodes. Some impax 2.5mm from Screwfix, some esab 3.2mm and some selectarc 3.2mm. Now, on the selectarc box it mentions drying out for 2hrs at 200°c. Is this before every use or just if they get damp? If they need pre heating every time then I will stick with .
If anyone prefers the , there's a full 5kg box I will swap for . Have to be local though as it's 5kg.
I think are all I will need, I only play about in the garage.

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Get some rods. Much easier to root with if you ask me, especially out of position, and is a lo-hy rod, basically a without the iron powder additive in the flux (might have my wires crossed though re the iron powder lol)




I do understand what you are saying about the Hydrogen content in a root deposited using diffusing into the covering passes when deposited with .
Makes perfect sense.
My question is,
Being as it is not the best idea to root with and then fill and cap with due to the hydrogen diffusing into fill passes, how come so many companies use procedures stating a / cap and then Lo hy fill and cap for quite critical welds, ie process pipework and storage vessels for oil refineries?? With the hydrogen content of these rods would the problem not be a lot worse than a root
The company I work for myself, uses this procedure ( fleetweld 5p+ root and hot pass, Philips/Esab fill and cap, or vodex fill and cap for less strength critical work) aswell as procedures requiring a root and fill and cap.

Also, does the same apply if welding a root pass with Argon/co2 MIG, then using FCAW fill and cap with lo-hy wire Murex B55??

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