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The Part0 and WeldConstraint/Part1 properties of a WeldConstraint set which two BasePart the weld connects. As soon as both properties are set and the weld is WeldConstraint/Enabled, the weld will lock the two parts together.

If Part0 or Part1 are ever set to new parts, then the WeldConstraint will instantly link the new part. The old part will no longer be constrained.


local partA = Instance.new("Part")
local partB = Instance.new("Part")
partA.Position = Vector3.new(0, 10, 0)
partA.Parent = game.Workspace
partB.Position = Vector3.new(0, 10, 10)
partB.Parent = game.Workspace
local weld = Instance.new("WeldConstraint")
weld.Parent = partA
weld.Part0 = partAweld.Part1 = partB