Tube to Tubesheet Joint welding.

[joshcbe]

Dear All,

Tube to Tube Sheet weld joint fillet overlapping how much is acceptable in ASME ..?

Thanks,
J. Joshua

 

[EdStainless]

Are you doing seal welds (with filler or without?) or strength welds?
These come in many varieties, most of which are detailed in various standards.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[r6155]

Can you send us a photo?

Regards

 

[chicopee]

Does the question apply to boilers or pressure vessels?

 

[SnTMan]

Toes of the weld overlap? Something else altogether?

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

What we are all saying is that you need to describe the problem better.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[meltedEng]

Per ASME, any amount. I haven't seen any client specs, or industry ones discussing this, in the chemical world anyway (I can't speak to boilers). As long as you have smooth transitions and can make each weld and aren't getting defects from subsequent welding on other fillets.

It's probably best you do a push-out test and validate your design though.

 

If overlap is significant you are probably overwelding.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[SnTMan]

I have seen any number of shell & tube exchangers welded, per the client specs, "seal weld with filler metal". The tube ends were so globbed up with weld metal I don't know how they got the tube rolls inside.

Unbelievably ugly, perfectly acceptable

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[meltedEng]

> If overlap is significant you are probably over welding.

"significant" is the least quantifiable word. Either way, we regularly design and weld with significant overlap, and push-outs usually pass by a safe 10-30% margin.

 

Refer to SnTMan's comment.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[r6155]

joshcbe, are you there?

Regards

 

[meltedEng]

> Refer to SnTMan's comment.

He's not really saying anything other than ugly welds are acceptable and he's working with some garbage shops. Which is valid if they pass visual and LPE and you don't need better quality.

I was referring to your over-designed comment. Often the spacing is tight to meet thermal or the design requires a leak path and ligament that forces overlap.

 

I get all that. Please be a little less pedantic about this.

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

 

[SnTMan]

meltedEng, they WERE NOT garbage shops, rather very good shops bound by specification to do something that didn't make sense.

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[SnTMan]

But, neither here nor there, really

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[r6155]

I assume that mock up was not made.
Regards

 

[MJCronin]

Chief welder at your local Garbage Shop .....

MJCronin
Sr. Process Engineer