US Patent 10155280 End assembly for welding device

An end assembly for use with a welding device having a contact tip, a diffusor, an insert, and an gooseneck, and the contact tip has a convex end that contacts a concave end of the insert, and the insert has an opposite end in contact with the gooseneck. The contact tip is threaded into the diffusor at one end of the diffusor, and the gooseneck is threaded into the diffusor at the opposite end of the diffusor, and the insert is disposed within the diffusor and between the contact tip and the gooseneck, such that a conductive path exists between the gooseneck, the insert, and the contact tip. The contact tip, insert and gooseneck are constructed of a conductive material which are securely held together in contact by the diffuser constructed of a dissimilar material.