Welding the arms to the characters head?

I have tried welding the characters to the head so the arms move up and down. (Already made the up and down for the head).

Here is what I have atm:

game.Players.PlayerAdded:connect(function(player)
player.CharacterAdded:connect(function(character)
local Weld = Instance.new("Weld",character.Head)
Weld.Part0 = character.Head
Weld.Part1 = character["Right Arm"]
local Weld2 = Instance.new("Weld",character.Head)
Weld2.Part0 = character.Head
Weld2.Part1 = character["Left Arm"]
end)

If anyone could help me thanks!