welding stainless exhaust box.... - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 03-30-2008
Senior Member
 
Join Date: Sep 2006
Posts: 2,207
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 9
Rockter will become famous soon enough
welding stainless exhaust box....

I noticed today a wee line of bubbles coming out of the weld on the entry side of the stainless exhaust box on my olde ship. The motor is an MD17C.

I cannot face replacing the whole unit. Not right now anyway. I will buy a new exhaust box, and fibre-glass is attractive, but we will try welding first, if practicable.

The weld has gotten a bit tired. I had hoped to weld it in situ as the exhaust hoses will be very difficult indeed to remove... they were very difficult to get ON, some 12 years ago..... so is suspect I will tear something up trying.

It may not work, but I am trying only to re-establish the weld, and nothing else.

A guy I know has a welder and we could transport it the 90 miles to the boat.

Is stainless relatively easy to weld? I know we must use chrome-rich electrodes, but what else must we watch for?

Thanks.
Reply With Quote Share with Facebook
  #2  
Old 03-31-2008
Senior Member
 
Join Date: Dec 2003
Posts: 1,366
Thanks: 1
Thanked 15 Times in 14 Posts
Rep Power: 11
capttb is on a distinguished road
I'm not a welder, but last time I had stainless repaired it needed to be TIG or MIG and was an effort to find a welder who could do the work & had time for a small job. Trying to weld in the boat sounds possibly hazardous. If it's just one tiny spot I might try something like J-B Weld (an epoxy) as a temporary repair.
Reply With Quote Share with Facebook
  #3  
Old 03-31-2008
zz4gta's Avatar
I don't discuss my member
 
Join Date: Aug 2007
Location: Chesapeake Bay
Posts: 2,441
Thanks: 0
Thanked 16 Times in 16 Posts
Rep Power: 8
zz4gta is on a distinguished road
What welder do you plan on using? How are you going to weld it?

TIG and MIG are very common. After setting up the stinger, a monkey could MIG weld. However, I'd highly suggest removing it from the boat. If that can't be done, have a "buddy" with a fire extinguisher at the ready. And make sure you have a fan running to keep fresh air coming in. Gases from welding can kill you.
__________________
Merit 25 # 764 "Audrey"

Last edited by zz4gta; 03-31-2008 at 12:31 PM.
Reply With Quote Share with Facebook
  #4  
Old 03-31-2008
zz4gta's Avatar
I don't discuss my member
 
Join Date: Aug 2007
Location: Chesapeake Bay
Posts: 2,441
Thanks: 0
Thanked 16 Times in 16 Posts
Rep Power: 8
zz4gta is on a distinguished road
A slower approach may be to try and use a small oxyacetylene torch. You can pick them up at some hard-ware stores.
__________________
Merit 25 # 764 "Audrey"
Reply With Quote Share with Facebook
  #5  
Old 03-31-2008
jrd22's Avatar
Courtney the Dancer
 
Join Date: Nov 2000
Location: San Juan Islands., WA, USA
Posts: 3,817
Thanks: 3
Thanked 15 Times in 15 Posts
Rep Power: 14
jrd22 will become famous soon enough
I would guess that if the weld is starting to leak it is probably at the edge of the weld and that area might be very thin. Usually by adding more weld you will burn thru, or just move the crack further along. To do it right you should probably weld the leak and then grind it down and weld a plate over the top which will probably require taking it out of the boat. Sorry, I know you didn't want to hear that. If this is a short time fix, you have nothing to lose by trying to simply weld it, but I'm betting it is on the underside (hard to get to) of the pipe and it will be difficult to do a good job of welding.

Good luck, John
__________________
John
SV Laurie Anne

1988 Brewer 40 Pilothouse

Reply With Quote Share with Facebook
  #6  
Old 03-31-2008
pfatyol's Avatar
Swansea, MA
 
Join Date: Dec 2003
Location: Massachusetts
Posts: 98
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
pfatyol is on a distinguished road
I teach welding at a local Vo tech from time to time (full time Manufacturing Engineer). Even though SS is easier to weld than steel, there are a few things to watch out for. Filler material, if box is 304 or 303 your going to want to use 308, but if it is 316 then 316 will be preferred. I have never attempted to stick weld SS, I always have used Tig or Mig. In which the argon is heavier than air so be careful. Additional if you have too much airflow through the engine compartment you'll blow the shield gas away and contaminate the weld. The weld will be much more prone to corrosion.
fficeffice" />>>
I would strongly suggest removing the exhaust box off and dropping off to be rewelded. With a box on the bench it would be far easier to get proper bead laid depending upon the conditions. We Tig weld SS that is .020" without burning through. A local Vo Tech welding class might be willing to do the job for free or for a small fee.
>>
Good luck,
>>
Patrick
>>
Reply With Quote Share with Facebook
  #7  
Old 03-31-2008
Senior Member
 
Join Date: Sep 2006
Posts: 2,207
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 9
Rockter will become famous soon enough
Guys...
Thanks.
To get it off the boat will mean either cutting the exhaust pipe between engine and exhaust box, or taking off the exhaust elbow. I was anxious to disturb as little as possible.
I had a look at the Vetus website today. perhaps I should fit one of their new exhaust boxes....?....

Welcome to Vetus.com!

...page 145 or thereabouts, and they are not wildly expensive.

Shame top dump the current box, but it looks like chlorine has had a go at the weld.
Reply With Quote Share with Facebook
  #8  
Old 03-31-2008
Valiente's Avatar
Senior Member
 
Join Date: Jun 2006
Location: Toronto
Posts: 5,491
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
Valiente has a spectacular aura about Valiente has a spectacular aura about
I went from an Onan "pot" type waterlift muffler to a plastic Vetus "waterlock". It was awkward to get at, but it was a huge improvement as the Onan was crumbling on the inside and letting water backsiphon into my Atomic 4...bad, bad.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Stainless 101 sailnaway Gear & Maintenance 2 01-28-2005 05:02 AM
Refrigeration—Part I Tom Wood Gear and Maintenance Articles 0 04-28-2003 08:00 PM


All times are GMT -4. The time now is 12:59 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.