Bonding is the permanent joining of metallic parts to form an electrically conductive path that will assure electrical continuity and the capacity to conduct safely most any current likely to be imposed on it 接合是金属部分的一种永久性连接从而形成一个电子导电通道，确保电子连续性以及电容能够更为安全地引导可能施加在金属表面的任意电流。
