How to create proper displacement for weld joints? I am looking for a way to create procedural weld joints in blender.

Here are some reference images showing what I am looking for:

https://www.flickr.com/photos/jimgrant/105352380

https://www.flickr.com/photos/7363531@N05/477075888

https://www.flickr.com/photos/fstorr/5440129655

The basic approach I have been taking is to create a base mesh then use a skin modifier fallowed by a subserf modifier with a bunch of displacements after that. However I am not happy with the result, I think that the displacement textures need to be different(in this case I am using two cloud textures). This is the result that I got so far:


One thing that you might notice in the reference pictures is that weld joints tend to have a beaded look to them due to how the individual drops of metal fell into the seam and overlapped each-other. I am not sure how best to replicate this with a displacement. I thought about using Metaballs but those are hard to work with and getting some kind of displacement or randomization on them would be very hard (not saying that they are not an option though).

What are you thoughts? Dose anybody know of a good way to quickly and easily create a procedural weld joint?
You said you wanted a to do this procedurally, but I personally would recommend using an image texture like this one. 

This image was created by me, and is in the public domain. Use it however you want :) Click for larger size


This displacement map produced a result like this: