Re: [PSUBS-MAILIST] stick welding 101

[Jon Wallace <jonw@psubs.org>]

Alec, Frank,

Thanks for the info.  I'll be joining a welding class in August.

Jon



ShellyDalg@aol.com wrote:
> Jon. If the hull is 70 series ( AS 516-70 ) then you use 7018 on 
> everything. Filler metal is always to match the base metal. I suggest 
> TIG the root, stick the filler, and TIG the cover pass. Then back 
> grind the inside and TIG that with a cover pass. ALL of it with 70 
> series rod. The process of laying down small overlapping TIG beads 
> makes a very strong and clean weld, without applying a ton of heat to 
> the joint being welded. That reduces stress build-up, and it's much 
> easier to make really clean welds. Bad thing is, it's slow and you 
> need cover gas too ( ARGON ) which runs about $125 a bottle. Still, 
> the weld quality is the best.
> When you stick weld the filler pass, make sure you clean the 
> start/stop REAL good, and when you lay down the TIG cover pass, most 
> inclusions or weld defects from the stick weld pass will show up as a 
> little hole or bubble. Stop welding, and grind or drill out the 
> inclusion down to nice clean steel.
>  It's a good idea to get a stainless wire wheel on your little 
> grinder and keep it right next to you so you can clean out the 
> start/stop while it's still hot. Start the stick "ARC" a little before 
> the end of the previous bead, then weld over the end and down into the 
> groove so the molten puddle flows and fuses with the previous bead. 
> Any wobbling or nasty stuff from starting the arc will be on top of 
> the previous bead and is easy to buff off with the grinder before you 
> start the TIG cover passes. Mostly just practice. Although I've been 
> welding for over 40 years, I still run a practice bead on scrap every 
> time I get ready to weld stuff. It helps me focus on making a good 
> weld, and if there's any adjustment with the machine or my position or 
> what ever, better to get that all fixed on the scrap, and get your 
> mind focused on the welding to be done.
> Frank D. 
>
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