Scooterotica

How large are the lumps of slags left over from welding these tanks?

tony wrote:How large are the lumps of slags left over from welding these tanks?

Large slags you say?

if these are TIG welded were does the slag come from in 30 yrs of welding i have never seen slag from a tig weld i have seen oxidisation or coking as its called but that is still fixed to the underside of the weld not anything that normaly brakes off and if it does its in bigger pieces than will be able to pass through a main jet , i would have though any abrasive would wear the barrel in more than one place im no expert but this looks like wear as the piston thrusts upwards, i had barrel damage like this on a cast item and ian frankin said it was was becouse the piston dipped into the exhaust port(as it was wide and long) on the upward stroke my piston was also worn on the botton from the rings upwards to the crown and the top ring was stuck ,ian then said the piston was top heavy as alot of the skirt had been removed as i was running a standard 107 con rod on a TS250 piston the inlet side was also worn on the last trailing edge as well altho this was just "polished" and not worn as much as the bottom just a thought

blimey them two would wear anything out.
Thats obviously it. The Fat Slags broke the rb kit!

shocky wrote:if these are TIG welded were does the slag come from in 30 yrs of welding i have never seen slag from a tig weld i have seen oxidisation or coking as its called but that is still fixed to the underside of the weld not anything that normaly brakes off and if it does its in bigger pieces than will be able to pass through a main jet , i would have though any abrasive would wear the barrel in more than one place im no expert but this looks like wear as the piston thrusts upwards, i had barrel damage like this on a cast item and ian frankin said it was was becouse the piston dipped into the exhaust port(as it was wide and long) on the upward stroke my piston was also worn on the botton from the rings upwards to the crown and the top ring was stuck ,ian then said the piston was top heavy as alot of the skirt had been removed as i was running a standard 107 con rod on a TS250 piston the inlet side was also worn on the last trailing edge as well altho this was just "polished" and not worn as much as the bottom just a thought

I have to agree on the welding if its Tig I wouldnt expect any harmfull residue to be inside the tank as its a very clean weld most stainless used in the food industry is Tig welded and both sides of the welded joint are usually clean and fairly smooth once welded.

Possibly if the stainless sheets are polished after rolling, this prior to being cut and pressed just before welding, then maybe some polish could get into the inside of the tank. In my opinion only if a tank has been media blasted then there isnt usually a problem. I think the "Polish residue in stainless petrol tanks" is a bit of a convenient "Red Herring"

I somehow dont believe that polish residue will eat away nicasil over the ex port only. Bead blast in tanks ,fine enough to get through carb filter and jets... sure. Wear would be apparent everywhere.

i,ve yet to see similar damage on TS1,s and imolas ......

Firstly apologies for jumping to conclusions. It didn't help that the announcements were cunningly concealed in the welcome section.

Shocky; I don't know if it's slag exactly. But I have seen it with my own eyes and it appears to be fine like sand and reddish in colour if I remember rightly. The carb was thoroughly cleaned and the problem repeated itself. So it can only have been coming from the fuel tank. You could say, yeah it was bad fuel, but it's unlikely that it all came from the same place. There was enough for a beach in there.

This is what I washed out of my brand new stainless tank.

what a fingernail