Claims
- 1. A method of manufacturing a spark plug electrode comprising the steps of:
- preparing an elongated blank metal made of a nickel-based alloy;
- concentrically placing a slug on an end surface of the elongated blank metal, the slug being made of a noble metal; and
- applying a laser beam welding on the slug to thermally melt whole the slug to form a firing tip so that the end surface of the elongated blank metal is partly fused into the slug in the range of 0.5 wt % to 80.0 wt %.
- 2. A method of manufacturing a spark plug electrode as recited in claim 1, wherein the slug is made of a platinum-based alloy, and the blank metal is made of a nickel-based alloy which includes 15.0 wt % chromium and 8.0 wt % iron.
- 3. A method of manufacturing a spark plug electrode as recited in claim 1, wherein the slug is in the form of pellet or powder.
- 4. A method of manufacturing a spark plug electrode as recited in claim 1, wherein the laser beams are such that a cone-shaped interface is provided between the firing tip and the end surface of the blank metal.
- 5. A method of manufacturing a spark plug electrode as recited in claim 1, wherein the laser beams are released by energizing a laser beam device with a power source of 340 V, and shot once or several times with a width of pulse of 9.0 ms at the time of applying the laser beam welding.
- 6. A method of manufacturing a spark plug electrode comprising the steps of:
- providing a composite column by embedding a heat-conductor core into a metallic clad by means of extrusion;
- concentrically placing a slug on an end surface of the metallic clad, the slug being made of a noble metal; and
- applying a laser beam welding on the slug to thermally melt whole the slug to form a firing tip so that the end surface of the metallic clad is partly fused into the slug in the range of 0.5 wt % to 80.0 wt %, a diameter of the firing tip being greater than 0.3 mm, but smaller than a diameter of the end surface of the metallic clad.
- 7. A method of manufacturing a spark plug electrode as recited in claim 6, wherein the slug is made of a platinum-based alloy, and the metallic clad is made of a nickel-based alloy which includes 15.0 wt % chromium and 8.0 wt % iron.
- 8. A method of manufacturing a spark plug electrode as recited in claim 6, wherein the slug is in the form of a pellet or powder.
- 9. A method of manufacturing a spark plug electrode as recited in claim 6, wherein the laser beams are such that a cone-shaped interface is provided between the firing tip and the end surface of the metallic clad.
- 10. A method of manufacturing a spark plug electrode as recited in claim 6, wherein laser beams are released by energizing a laser beam device with a power source of 340 V, and shot once or several times with a width of pulse of 9.0 ms at the time of applying the laser beam welding.
Priority Claims (2)
Number |
Date |
Country |
Kind |
3-346901 |
Dec 1991 |
JPX |
|
4-114809 |
May 1992 |
JPX |
|
Parent Case Info
This is a divisional of application Ser. No. 07/997,565, filed Dec. 28, 1992, now abandoned.
US Referenced Citations (13)
Foreign Referenced Citations (3)
Number |
Date |
Country |
3433683 |
Jun 1985 |
DEX |
58-59099 |
Apr 1983 |
JPX |
WO8901717 |
Feb 1989 |
WOX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
997565 |
Dec 1992 |
|