What happens to extra materials from salvaged junk?

So I have read through multiple questions about how the workshop handles the various categories when it automatically scraps things to produce raw materials for projects that you are building. It has been clearly shown that anything outside of the "junk" category is safe from automatic salvage.
However, I wanted to know what happens to things in the "junk" category when they are salvaged. If something from junk gets automatically dismantled to supply some material for a project, but the project only requires one of the several pieces of material from that broken down junk, do you still get the left-over materials or are those used up as well? I know that if you manually break down junk items yourself (i.e. drop them on the ground and use the settlement interface to break them down) then all of the materials are stored in your workbench, but what happens to those materials when the pieces are broken down automatically?
Best Answer
The same thing happens with those materials, you do not lose anything from what I can tell.
For example (I'm making up exact components/amounts for simplicity), say you want to build Fisto (not actually in FO4, as far as we know, I just like that robot) and only have all required Fisto components except for a screw in your materials. Suppose manually breaking down a cabinet yields:
- Wood(4)
- Steel(2)
- Screws(2)
Assume you only need 1 more screw for your Fisto and only a cabinet is in your junk to be scrapped. You build your item and now your materials should be:
- Wood(4)
- Steel(2)
- Screws(1)
And of course there is no more cabinet.
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What does scrapping junk do in Fallout 76?
Scrapping junk items will let you break down items into essential crafting materials like wood, steel, glass, etc. You're going to need lots of these materials, so it's a good idea to pick up as much of this as you can and then scrap it all.How do you scrap inventory items?
Once you find the item, just press the "scrap" button. Finally, for settlement junk, open the workshop menu and select an item in the settlement; you'll notice which ones can only be scrapped as they will be highlighted yellow.SALVAGE KINGS | What Happens To Building Materials?
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Answer 2
If the item is in your inventory then it will put the extra parts into the nearest workshop as well. I just got finished doing the experiment by taking one component out of my workshop, putting it into a regular container, then made something that needs the component but the the rest of the parts to the junk item I had in my inventory. I've only tested it with junk so far and I don't expect it will auto-scrap anything else in your inventory, at least I hope it wouldn't!
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