Weldment Manufacturing and Part Numbers in Production 2

[HungryDinosaur_imported]

Hi All,

I am working in a company where a weldment item is made up of 2,3 or more parts welded together. As per standard industry practice, this item will have a single part number. But here, they have give all different part numbers to the items welded in the weldment. So they consider this as an assembly. Something not I am used to when it comes to weldment (it should be a single part number). During the manufacturing process, there is a Job Route document, which has the whole process (receiving item from store, cut items, weld, paint, etc), so each item goes through a process and signed off.

My question is anyone have this kind of process in the shopfloor, but using a single part number for the weldment? How does it affect the SCM process while ordering similar parts from two different weldments? Any pros and cons of both systems? Thanks in advance.

Regards,

HD

 

[SwinnyGG]

Just use the assembly part number in the next level up?

If you didn't have part numbers for things that were assembled in your shop, you wouldn't have part numbers for anything.

 

[Gr8blu]

Most likely reason for "part" numbering to create an "assembly" is that the individual pieces that make up the assembly could be used (now or sometime in the future) as parts of another assembly. The other main reason is to simply keep track of the number of bits and pieces (although this could also appear as "ASSEMBLY NO - Item No."

By definition, a "part" number refers to the smallest piece of material that is made all in one shot. If something requires putting two or more "parts" together, it becomes the next level up - an "assembly". Most bills of material have very similar-looking sequences for "part" and "assembly" numbering.

Converting energy to motion for more than half a century

 

[CWB1]

Weldments are assemblies. If you assign a single p/n then you have no ability to source the individual components separately, fabricate them via different processes, track similar parts separately, etc. Its a quality nightmare and disqualifies the shop from ISO/other certs.

 

[geesaman.d]

My company does weldments both ways, and as it's already been described, if a burnout or subcomponent has applicability elsewhere, we have a separate part number for it.

We no longer stock loose subcomponents or do welding in-house but our vendors still enjoy some efficiency from having the separate part numbers.

When a weldment is fully custom, we usually just add to the top level part number for each subcomponent: part number 12345-23456 would be fabricated from a 12345-23456-1, 12345-23456-2, 12345-23456-3, etc.

On the floor, having a weldment of completely unrelated numbers can be inconvenient. It may require extra measures like better part marking, double-checking each piece after tacking in place, PMI, and so on. If you work with refineries in any part of your work then that level of material tracing is not new.

 

[mfgenggear]

Hungry
Yes simple, details must have different part numbers for accountability. Costing. Stocking procuring and manufacturing.

The assembly must have a kit, that way all parts that go into the assembly. Are verified.

This type of assembly can be described as an inseparable assembly. Because it is welded together.

The assembly drawing must have a parts list.