RIPPED MY HOE BUCKET OPEN LIKE A BEER CAN TAB!!

[greenmule]

Yeah,maybe but we ain't talking in a pipe,we are talking out of a confined area,think about it.

Problem with this line of thinking is you guys are saying what caused the crack to grow,the question is,what made the area where crack started.

Like I and other [well maybe one other] has said,can't tell more than 75 percent from those pictures but it kinda looked like weld had lack of fusion/penatration,where crack started.If thats the case,manufactoring of bucket/assembly is the cause of this,not use.

 

[ChuckinNH]

Yeah,maybe but we ain't talking in a pipe,we are talking out of a confined area,think about it.

Problem with this line of thinking is you guys are saying what caused the crack to grow,the question is,what made the area where crack started.

Like I and other [well maybe one other] has said,can't tell more than 75 percent from those pictures but it kinda looked like weld had lack of fusion/penatration,where crack started.If thats the case,manufactoring of bucket/assembly is the cause of this,not use.

Which is why I kind of suggested that he let his dealer look at it even though it's out of warranty...... might get a new bucket out of it since Kubota could be interested in the failure......... I worked for a manufacturer of consumer goods for a long time, and we sometimes did things like that to learn more about things that did fail, our fault, or not.

 

[greenmule]

Whatever,as long as you now know water freezing did not cause this weld to fail.

 

[J_J]

Yeah,maybe but we ain't talking in a pipe,we are talking out of a confined area,think about it.

Problem with this line of thinking is you guys are saying what caused the crack to grow,the question is,what made the area where crack started.

Like I and other [well maybe one other] has said,can't tell more than 75 percent from those pictures but it kinda looked like weld had lack of fusion/penatration,where crack started.If thats the case,manufactoring of bucket/assembly is the cause of this,not use.

With all due respects, the weld does not seem to be affected, it still looks pretty good, Where it seem to fail is at the edge of the weld, which I refer to in my earlier post. That would go along with the logic that due to the geometry of the tabs to the bucket, that a good bit of dropping the bucket straight down hard, and using it as a pry bar, just might fatigue the metal over time to do just what it did. Escavader already said he worked the bucket pretty hard. If the crack had started on the bottom of the round tube that supports the tabs, you probably would not know it until it just ripped open one day. Some of us probably have not even seen the bottom of our tractors, or cars, etc.

 

[Egon]

With all due respects, the weld does not seem to be affected, it still looks pretty good, Where it seem to fail is at the edge of the weld,

Is it possible there are some type of weld scenario's that would exacerbate this type of failure?

 

[greenmule]

Well,unless you can see that weld better than me on the picture[unless he posted more],than you can't tell either.

To me it looked like there was three areas,shiny,rusty and a black like area,the black like area is what I'm saying MIGHT be lack of fusion/penatration,like I said,might.[havn't looked at them for a while,so going from bad memory].

I can't tell from pictures any more than you to be sure.

Point here is,did it fail cause of base metal tearing for some reason,or did it fail in weld,if it failed in weld cause of weld defect than,he could say,my hoe broke cause of a bad factory weld[but,that and 50 cents would probably just get him a small coffee],just we ain't figured out where crack started.

Wonder if he took any more pictures,has he already fixed it?

 

[J_J]

Escavader said he had the solid bar to mount the tabs on, and some 1/2 in plate, so he probably has it fixed by now, although he said he was busy.

 

[Tollster]

Just looked over your plight, and after viewing the pictures, I would say that there is a very high probability there was some undercut at the toe of the fillet weld. Typically the welds are stronger than the adjacent basemetal (Heat affected zone or HAZ), this is due to the amount of heat put into the base metal during the welding process which realigns the molecular structure of the basemetal, therefore any type of discontinuity (flaw) will exaggerate stresses to that area over time. Typically if you can catch a fingernail on the undercut, it needs to be blended into the adjacent surface or buttered up. When blending care should be taken not to reduce base metal thickness and it should be blended into a nice smooth transition, so you do not create another stress point, or notch that would lead to another failure.
Any type of notch, undercut, convexity, concavity, crater, cold lap, etc.. within the weld or within .50" (Arc strikes, weld spatter, .50" covers the HAZ) of the weld toe has a high chance of failure under normal duty.
Tollie Perry

 

[Egon]

some undercut at the toe of the fillet weld.

Ah Ha!

 

[greenmule]

Don't think any items such as this,will have a weld failure due to splatter or a normal arc strike,also don't think on an item like this convexity or concavity[normal amount of either] will either.Codes allow both to a certain amount.

Most welding codes allow some undercut,[1/32],and again,don't think 1/32 or even 1/16 would cause this.

Now,lack of fusion,yes,lack of penatration,yes.