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name: Weld
type: class
memory_category: BaseParts
summary: ''
description: |
  An object used to hold two objects together in a relative position, regardless
  of whether they're touching. This object is placed inside of a
  `Class.BasePart` and the `Class.JointInstance.Part1|Part1` property determines
  which other part should be welded to the original part. Two
  `Datatype.CFrame|CFrames`, `Class.JointInstance.C0|C0` and
  `Class.JointInstance.C1|C1`, then determine how the parts should be placed.

  See also `Class.RigidConstraint` for a newer alternative using the constraints
  system that does not require `Class.JointInstance.C0|C0` or
  `Class.JointInstance.C1|C1`, but instead uses `Class.Attachment|Attachments`
  to control offsets through `Class.Constraint.Attachment0` and
  `Class.Constraint.Attachment1`.

  While the weld is `Class.JointInstance.Active|Active`, it maintains the part
  positions such that:

  `part1.CFrame * C1 == Part0.CFrame * C0`

  #### Root Part

  Every assembly has a root part (see `Class.BasePart:GetRootPart()`). When a
  weld's `Class.JointInstance.C0|C0`/`Class.JointInstance.C1|C1` is modified,
  the root part will stay where it was.

  #### Directionality

  Welds do not have any directionality. Imagine rigid joints forming a tree,
  branching up from the root part such that all the parts up the tree from the
  root will move and their welded "children" will move with them.
code_samples: []
inherits:
  - JointInstance
descendants: []
tags: []
deprecation_message: ''
properties: []
methods: []
events: []
callbacks: []