Tool arm weld only works once then stops working, how can I make it always work?

When I open up the tool it works, then when I open it again it doesn't, Can anyone help me?

local Tool = script.Parent --make sure this is a Tool object
local player = game.Players.LocalPlayer
local char = game.Players.LocalPlayer.Character
local arm = {char["Right Arm"]}
local weld = Instance.new("Weld", arm[1])
Tool.Equipped:connect(function(Mouse)
weld.Part0 = char.Torso
weld.Part1 = weld.Parent
weld.C1 = CFrame.new(-1.5,0.5,-.5)*CFrame.Angles(math.rad(45),0,0)
end)

Tool.Unequipped:connect(function(mouse)
    weld:Destroy()
end)

Use Animations instead, they are more efficient, easier to use, and do not break as often as an old arm weld script. https://www.roblox.com/library/144373835/Animation-Editor Try to search up some tutorials or something on how to use it, and you will be able to also animate (assuming you are using a gun because that's what arm weld scripts were usually used for) shooting and reloading easier (and better looking) for example.