Thought Regarding 6mm sheet

[pete23]

ive a 1890s bantoc, overplated on the knees.

 

[spaffmonkey]

Is that your reason for welding

 

[pete23]

no, been living on her for about 12yr, had two other boats before. I used to fit boats out at braunston, always been into welding, just started part time for a comp as the woodwork side of things is a tad slow at the min.

 

[spaffmonkey]

Are ok i worked at hillmorton boatyard for a while during uni hols. ill be doing the welding at braunston next weekend ordered all the metal today.

 

[Drains]

Everning all.

Would you root and cap it, or v the edges and do it in one hit, or something else

Ive welded sheet like this before but just wonder how others choose to go about it.

I'd cut the plate slightly small to leave a 2mm gap between new and old all the way round and weld it both sides. Nice and hot will give you a neat slightly convex weld.

I'd gap it to 2mm, leave a 2mm land and vee prep to 60 degrees. To make sure your penetration is correct, use some scrap with the same prep to get your volts right but do it for the same positions you'll be welding in (the vertical ups should be no more than 18v, ish. Any other positions, higher volts, but probably not much more than 21v). It doesn't matter whether you do it in one hit or two, so long as you get full pen on the root.

 

[Welderpaul]

I'd gap it to 2mm, leave a 2mm land and vee prep to 60 degrees. To make sure your penetration is correct, use some scrap with the same prep to get your volts right but do it for the same positions you'll be welding in (the vertical ups should be no more than 18v, ish. Any other positions, higher volts, but probably not much more than 21v). It doesn't matter whether you do it in one hit or two, so long as you get full pen on the root.

Would you really bother with a V prep Si? 6mm isnt thick, and a gap gives enough to burn the edges in and get really good penetration. Welded from oot side would be fine, both sides in an ideal world.

 

[Drains]

Would you really bother with a V prep Si? 6mm isnt thick, and a gap gives enough to burn the edges in and get really good penetration. Welded from oot side would be fine, both sides in an ideal world.

Er, no I wouldn't, but for the sake of folk here it's possibly better advice. The vee allows for less than perfect technique and not fantastic plant.

The voltage settings and travel speeds will make a huge difference. You'd probably do any horizontal welds in spray arc, going at it like the clappers.

 

[spaffmonkey]

Im used to welding 6mm and my plant is upto the job.
I was just seeing what to general opinion was as Ive done it all the ways mentioned.