Patent ID: 11913478
Assignee: BUEMACH ENGINEERING INTERNATIONAL B.V.
Field: Machine tools (Mechanical engineering)
Classification: CPC F  B | IPC B  F

Claim 0:
1. A piston unit of a working cylinder, comprising:
a piston and a piston rod, said piston having an axial bore hole formed therein, said piston rod having a chromium-plated outer lateral surface, said piston rod being received in said axial bore hole, said piston rod and said piston being connected with a material-bond by a circumferential laser ring weld seam, said laser ring weld seam defining a pressure medium-tight sealing plane; and
said outer lateral surface having a non-chromium-plated cross-sectionally reduced annular section, an annular compensation layer arranged between said piston and said cross-sectionally reduced annular section, said laser weld ring seam including a radial inner laser ring weld seam connecting said piston rod to said annular compensation layer and a radial outer laser ring weld seam connecting said annular compensation layer to said piston.