• Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!

Boom pin, crack fix

ddigger

ddigger

Senior Member
Joined
Jan 19, 2009
Messages
567
Location
Northern California
Occupation
contractor,owner operater
After a much needed off season bath, I found an ugly crack in the pin boss on the boom pin closest to the cab(couldnt be on the easy side).
crack.jpg
So after a bunch of grinding and alittle die grinder and tourch work we are here.
crack1.jpg
And then after an afternoon of welding, were back to here and ready for a little paint, and putting the window back in.
crack2.jpg
crack3.jpg
If you look close in the last picture you can see the copper plate that was used so the weld would not stick to the pin.
 
S

shinigamix2x

Well-Known Member
Joined
Jun 8, 2009
Messages
73
Location
Trinidad
Awesome work mate, could you recommend the best type of welding rods to use for this type of work?
Thank you.
 
H

HCF

Well-Known Member
Joined
May 23, 2010
Messages
192
Location
Springfield, Or.
Occupation
Fabricator
shinigamix2x said:
Awesome work mate, could you recommend the best type of welding rods to use for this type of work?
Thank you.
Click to expand...

If you are buying electrode from a welding shop ask for low hydrogen stick. Something like 7018 or 7016. However, if you are welding something with an open root I would suggest 6010 or 6011 for the root pass, then fill the remainder with the low hydrogen electrode. Also, pre heat never hurts. Hope this helps.
 
H

HCF

Well-Known Member
Joined
May 23, 2010
Messages
192
Location
Springfield, Or.
Occupation
Fabricator
Ddigger: looks good from here! That's not the best spot to get into. Now I know why you had to put the window back in. Lol.
 
Nige

Nige

Senior Member
Joined
Jun 22, 2011
Messages
29,247
Location
G..G..G..Granville.........!! Fetch your cloth.
HCF said:
If you are buying electrode from a welding shop ask for low hydrogen stick. Something like 7018 or 7016. However, if you are welding something with an open root I would suggest 6010 or 6011 for the root pass, then fill the remainder with the low hydrogen electrode. Also, pre heat never hurts. Hope this helps.
Click to expand...
A needle gun and peening every pass to stress-relieve it after removing the slag doesn't hurt either.
 
S

shinigamix2x

Well-Known Member
Joined
Jun 8, 2009
Messages
73
Location
Trinidad
Yes sir, it sure does help, i'm a beginner welder and posts like these helps a lot to broaden my knowledge, i've seen these types of cracks before, but management just decides to dump the part and spend a butt-load to purchase new ones. Thank you for sharing.
 
John C.

John C.

Senior Member
Joined
Jun 11, 2007
Messages
12,870
Location
Northwest
Occupation
Machinery & Equipment Appraiser
Usually people add a half in piece of bar stock over the top of that and run it back down the frame about a foot and half. That is a beautiful job by a highly skilled craftsman.

Thanks for the photos.
 
Nige

Nige

Senior Member
Joined
Jun 22, 2011
Messages
29,247
Location
G..G..G..Granville.........!! Fetch your cloth.
Looking back at the photos I think I might just have tried to close up the crack before starting to make the weld repair, for the simple reason that the pin bore would be slightly oversize if the bracket was left as it was. That slight amount of "slop" between the two could end up giving the pin enough room to beat on the bracket and re-crack it. Just a thought.
 
You must log in or register to reply here.
Top