How do I make a weld for each side using a script?

So what I'm trying to do is make it so if two blocks touch when I run the game, they weld together I successfully got it however the welds aren't consistent, such as one side isn't welded to another. Here's what I have so far:

local block = script.Parent
block.Touched:connect(function(hit)
	if hit:FindFirstChild("values") and hit.values:FindFirstChild("isabrick") == true then
		local newWeld = Instance.new("Weld")
		newWeld.Part0 = block
		newWeld.Part1 = hit
		newWeld.Parent = script.Parent
	else
		print("hit is not a valid block")
	end
end)

Some sides don't weld to other blocks like so:

prntscr.com/iwsylp

The last time I saw one of your questions, I answered it with pleasure. Making a Weld instance is relatively easy; you just have to put it in the JointsService and not the Workspace. Here is a script that should work:

block = script.Parent
block2 = script.Parent.Parent.Block2 -- This assumes that the part is in the workspace, but you can name this whatever you want, as long as it is another part or side
function Weld()
	local weld = Instance.new("Weld", game.JointsService)
	weld.Part0 = block
	weld.Part1 = block2
	weld.C1 = block2.CFrame:toObjectSpace(block.CFrame)
end
Weld()

Not only will it weld, it will also maintain the weld as long as the group of parts being welded is not regenerated.