Hi, All…
Does anyone have a tip or technique or even is there an extension for producing the appearance of a welded joint between two objects?
Cheers
NW
Hi,
By hand, I would probably make that out of a push-pull or a follow me, adding a 3d bead along the seam.
by extension, I would go check Fredo6’s work, Fredocorner. It’s the same idea, but automated. select the lines that you wish to “weld”, select the profile of the rounding (the bead in your case), adjust, and boom.
It would not create an actual bead where you can read the movement of the welder but hey, it’s a quick fix 
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There was a Skill Builder Video about this
(1) Drawing a Weld with Native Tools - Skill Builder - YouTube
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hahaha, didn’t see that one, I’m torn, it is a really nice 3d execution of a not so good beady weld 
Hi.
I’ve been unable to find a practical way to create convincing weld beads, although I’ve seen some in other drawings. Unfortunately I don’t know how those were created. So I just manually create the same plain type as @ateliernab suggested. They don’t look like real welds, but I believe them to be an acceptable stylized alternative. It at least shows people where the welds are supposed to be. 
I have created quite a few simulated weld beads, see the images below (with and without hidden edges). My technique depends on the nature of the bead. For fairly smooth beads I usually use Follow Me with a custom approximate profile to extrude along the line of the bead, then tweak the positions of vertexes or sets of adjacent edges (with the Move tool) to introduce irregularity. For more rough beads where the individual beads are more prominent, I’ll create a single “blob” object such as a hemisphere (with Follow Me and an arc profile) then flatten it, distort it by moving vertices or rotating sets of edges. Once I like the blob I will place many copies of it along the general path of the weld, randomly tilting and rotating them slightly. Then I’ll explode the blobs, intersect them with each other, and clean out the unwanted debris
In either case, the final bead component is then fitted to its surrounding via Intersect With and cleanup of interior debris.
Here is a SketchUp model of one of the more irregular beads that I’ve modeled, with comparisons between the model in context and the corresponding real-life object.
HGA Downlock Body Weld Bead.skp (310.3 KB)
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Just my .02, but I would be more inclined to make the weld section whatever shape is appropriate, and then just make and apply a texture to denote the appearance of the weld. I do the same with screw threads. There’s no sense for what I do to eat up resources in the weld geometry. Location and notes are enough for a welder.