Frustrating pontoon repair

   / Frustrating pontoon repair #31  

CincyFlyer

Veteran Member
Joined
Jun 1, 2017
Messages
1,099
Location
West Chester
Tractor
Mahindra 2540
The PROPER repair would be to weld it.
TIG first choice and MIG if TIG is not available.
Rivets, glues or sealers are for emergency repairs or for amateurs.
Welding challenges are part of it and experience is learned.
If you are lucky there is an old Fart around to show you tricks.

In the past I would have agreed with you, but with a fairly large area that may have fatigue cracks, I'd likely either cut the entire area out and weld it, or go with a more flexible repair that won't introduce more stresses. Rivets, glues, and sealers still hold most flying machines together; they work quite well.
 
   / Frustrating pontoon repair #32  

TractorGuy

Elite Member
Joined
Sep 15, 2013
Messages
4,611
Location
N. FL
Tractor
John Deere 4310 CUT, Ford New Holland 575E Industrial Backhoe, John Deere F725 Front Mount Mower
In my VERY limited experience with welding aluminum the first thing I notice in your pictures is the patch area wasn't cleaned beyond the welded area. You don't have a chance in **** of getting a good weld unless the area is cleaned past the area of repair and you know your filler material is compatible with the material being welded. My first and best experience welding aluminum with a tig involved new material and compatible filler rod purchased from a source that knew what to supply me with. Some of my worst results involved me using the same filler rod on higher grade surplus aluminum and unknown grade aluminum.

Either way the darkness at the edge of the patch indicates they did a sloppy cleaning job before they started and haven't a clue how to weld aluminum.
 
   / Frustrating pontoon repair #33  

The Fred

Veteran Member
Joined
Jun 19, 2013
Messages
1,286
Location
hOOterville
Tractor
Boost it and Lose!
This is the PERFECT time to talk your wife into letting you buy a new boat!

Go for it buddy!
 
   / Frustrating pontoon repair #34  

ruffdog

Super Member
Joined
Dec 31, 2011
Messages
8,005
Location
southern wisconsin
Tractor
Bobcat Toolcat 5610G, Deere X744, Cub Cadet IH 982
Was the plug removed before welding? Air movement at the crack site would affect the shield gas and thus the weld. For smaller tanks, I have pumped in Argon to help the weld process. Most pontoons are a .080" material and should be plenty easy with a 1/16" tungsten. Before welding, etch with the arc and brush with a fine stainless brush. Weld out in the hot sun as it will help pre-heat the aluminum.
 
   / Frustrating pontoon repair
  • Thread Starter
#35  
OP
kevinwak

kevinwak

Platinum Member
Joined
Aug 13, 2011
Messages
596
Location
Northern Alberta
Tractor
John Deere 2520
This is the PERFECT time to talk your wife into letting you buy a new boat!

Go for it buddy!

Would love to buy a new one, but there are tons of things on the “to buy” list.
 
   / Frustrating pontoon repair
  • Thread Starter
#36  
OP
kevinwak

kevinwak

Platinum Member
Joined
Aug 13, 2011
Messages
596
Location
Northern Alberta
Tractor
John Deere 2520
Was the plug removed before welding? Air movement at the crack site would affect the shield gas and thus the weld. For smaller tanks, I have pumped in Argon to help the weld process. Most pontoons are a .080" material and should be plenty easy with a 1/16" tungsten. Before welding, etch with the arc and brush with a fine stainless brush. Weld out in the hot sun as it will help pre-heat the aluminum.

They did not remove the plug, even though I told them to. They didn’t believe that it would build pressure. . Then they questioned why I added so much air into it when I parked it in the sun. I didn’t add air, heat builds pressure.
 
   / Frustrating pontoon repair #37  

PILOON

Super Star Member
Joined
Aug 26, 2004
Messages
10,905
Location
North of Mtl,Que,Can (Ste Adele)
Tractor
MT180D
First thing that needs doing is to stop drill that crack.
Then whatever patch system used will work.
While welding seems the best I still believe a surface patch with 'POP rivets' or better still standard aircraft style brazier rivets and sealant is the proper way to go.
OK. so much for my 2 cents.
 
   / Frustrating pontoon repair #38  

dragoneggs

Super Star Member
Joined
Jun 9, 2013
Messages
14,612
Location
Seabeck, Washington
Tractor
Kubota BX-25D, Kubota Z122RKW-42
First thing that needs doing is to stop drill that crack.
Then whatever patch system used will work.
While welding seems the best I still believe a surface patch with 'POP rivets' or better still standard aircraft style brazier rivets and sealant is the proper way to go.
OK. so much for my 2 cents.
As an aerospace engineer with a fair amount of experience in adhesive bonding to metals and composites... if done right, I am totally with you. I call them 'chicken rivets'.
 
   / Frustrating pontoon repair #39  

ruffdog

Super Member
Joined
Dec 31, 2011
Messages
8,005
Location
southern wisconsin
Tractor
Bobcat Toolcat 5610G, Deere X744, Cub Cadet IH 982
They did not remove the plug, even though I told them to. They didn’t believe that it would build pressure. . Then they questioned why I added so much air into it when I parked it in the sun. I didn’t add air, heat builds pressure.

Yep...that is what I was thinking. Get someone with more experience.
 
 
Top