US 4,843,206 AGranted

Resistance welding electrode chip

AssigneeToyota Jidosha Kabushiki Kaisha

InventorsKazuo Azuma, Masahiko Inoue

Life of this patent

Estimating the term…

Loading patent…

Abstract

A welding resistance electrode chip of this invention comprises a front end to be brought into contact with a substance to be welded, an intermediate cylinder disposed on and in contact with the tail end of front end, and a main cylinder having a closed end disposed on and in contact with the tail end of front end and the tail end and the inner wall of intermediate cylinder. It is sintered and molded out of appropriate copper-based powder materials respectively satisfying the requirements of portions thereof: The front end is made of a powder material having good thermal shock resistance and wear resistance, the intermediate cylinder is made of a powder material having high tenacity to suppress the deformation of the front end, and the main cylinder is made of a powder material having high conductivity. Therefore, the durability of resistance welding electrode chip of this invention has been improved remarkably, and the operation rate of equipment has been improved.

Claims20

Dependent claims

A resistant welding electrode chip comprising:

a front end to be brought into contact with a substance to be welded;
an intermediate cylinder disposed on and in contact with the tail end of said front end;
and
a main cylinder having a closed end disposed on and in contact with the tail end of said front end and the tail end and the inner wall of said intermediate cylinder, wherein
said front end is made of a mixed powder material of at least one conductive ceramic powder selected from a group consisting of titanium carbide (TiC) powder, zirconium carbide (ZrC) powder, hafnium carbide (HfC) powder, tantalum carbide (TaC) powder, niobium carbide (NbC) powder, tungsten carbide (WC) powder, chromium carbide (Cr.sub.3 C.sub.2) powder, titanium nitride (TiN) and niobium nitride (NbN), and at least one of copper powder and copper alloy powder;
said intermediate cylinder is made of a mixed powder material of at least one powder material selected from a group consisting of zirconium boride (ZrB.sub.2) powder, titanium boride (TiB.sub.2) powder, tungsten carbide powder (WC) and molybdenum (Mo) metal powder, and at least one of copper powder and copper alloy powder;
and
said main cylinder is made of at least one of copper powder and copper alloy powder.

5 more elements

A resistant welding electrode chip comprising:

a front end to be brought into contact with a substance to be welded;
an intermediate cylinder disposed on and in contact with the tail end of said front end;
and
a main cylinder having a closed end disposed on and in contact with the tail end of said front end and the tail end and the inner wall of said intermediate cylinder, wherein
said front end is made of a mixed powder material containing from 10 to 20% by weight of at least one powder material selected from a group consisting of titanium carbide (TiC) powder, zirconium carbide (ZrC) powder, hafnium carbide (HfC) powder, tantalum carbide (TaC) powder, niobium carbide (NbC) powder, tungsten carbide (WC) powder, chromium carbide (Cr.sub.3 C.sub.2) powder, titanium nitride (TiN) and niobium nitride (NbN) mixed with base powder containing at least one of copper powder and chromium-copper alloy powder;
said intermediate cylinder is made of a mixed powder material containing 20% by weight of at least one powder material selected from a group consisting of zirconium boride (ZrB.sub.2) powder, titanium boride (TiB.sub.2) powder, tungsten carbide (WC) powder and molybdenum (Mo) metal powder mixed with base powder containing at least one of copper powder and chromium-copper alloy powder;
and
said main cylinder is made of at least one copper powder and chromium-copper alloy powder.

5 more elements

Dependencies are inferred from the claim text.