Tool cannot be picked up after being welded?

local Cup = game.Workspace:WaitForChild('Cup')
	local Part1 = Cup.Main

for i,v in pairs(Cup:GetChildren()) do
	if v:IsA('Part') then
		local Weld = Instance.new('Weld',Part1)
		Weld.C0 = Part1.CFrame:inverse() * v.CFrame
		Weld.Part0 = Part1
		Weld.Part1 = v
	end
end

I was making a weld in my tool, but came across a problem; after I had welded it, I couldn't pick it up. Is there a resolution for this? Why is this happening?