AT237401B - Process for the production of sintered, non-consumable, tungsten welding electrodes provided with control metals or oxides - Google Patents
Process for the production of sintered, non-consumable, tungsten welding electrodes provided with control metals or oxidesInfo
- Publication number
- AT237401B AT237401B AT561062A AT561062A AT237401B AT 237401 B AT237401 B AT 237401B AT 561062 A AT561062 A AT 561062A AT 561062 A AT561062 A AT 561062A AT 237401 B AT237401 B AT 237401B
- Authority
- AT
- Austria
- Prior art keywords
- production
- consumable
- sintered
- oxides
- electrodes provided
- Prior art date
Links
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 title description 6
- 229910052721 tungsten Inorganic materials 0.000 title description 5
- 239000010937 tungsten Substances 0.000 title description 5
- 238000000034 method Methods 0.000 title description 4
- 238000004519 manufacturing process Methods 0.000 title description 3
- 229910052751 metal Inorganic materials 0.000 title description 3
- 239000002184 metal Substances 0.000 title description 3
- 238000003466 welding Methods 0.000 title description 3
- 150000002739 metals Chemical class 0.000 title 1
- 239000000126 substance Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- IATRAKWUXMZMIY-UHFFFAOYSA-N strontium oxide Chemical compound [O-2].[Sr+2] IATRAKWUXMZMIY-UHFFFAOYSA-N 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Inorganic materials [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Description
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Verfahren zur Herstellung von gesinterten, nicht abschmelzenden,
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fes enthält.
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Als besonders vorteilhaft hat es sich erwiesen, beispielsweise das Barium- oder Strontiumoxyd in einen dünnwandigen Schlauch oder ein Rohr aus einem bei der Sinterung leicht verdampfenden Material einzubringen und diesen gefüllten Schlauch oder das gefüllte Rohr mit dem Wolframpulver gleichzeitig zu verpressen. Es ist auch möglich, mehrere Seelen auf diese Weise als Oxyde oder auch als Metallstäbe oder Drähte aus emissionsfördernden Stoffen in der Wolframelektrode anzuordnen, wodurch z. B. auch die Schweissnahtbreite ganz wesentlich beeinflusst werden kann.
Versuche haben ergeben, dass vorzugsweise bei der Gleichstrom-Schweissung der Brennfleck an der Spitze der Wolframelektrode fixiert wird und von so geringer Ausdehnung ist, dass an dieser Stelle die Wirksamkeit des Steuermetalles oder-oxydes als emissionsfördernder Stoff in besonderem Masse in Erscheinung tritt. Da sich der emittierende Stoff bedingt durch die erfindungsgemässe Herstellung beim Gleichstrom-Zündvorgang an der Berührungsstelle befindet, wird neben den schon beschriebenen Vorteilen auch noch die Zündfähigkeit ganz erheblich gefördert. Dies ermöglicht es, das emissionsfördernde Material in einem von der Fachwelt bisher für unmöglich gehaltenen wesentlich geringeren Prozentsatz zum Wolfram einzubringen, als es bisher in Form der Beimischung oder Ummantelung erforderlich war.
Aber auch bei der Wechselstromschweissung wird der Hochfrequenz-Zündvorgang wesentlich sicherer ausgelöst, als dies bisher möglich war. Darüber hinaus wird mit den erfindungsgemäss hergestellten Wolframelektroden eine wesentlich grössere Wärmekonzentration erzielt, wodurch die Schweissnaht nicht nur schneller und schmaler herstellbar ist, sondern auch in ihrem Aussehen und ihrer Struktur bedeutend verbessert wird.
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Process for the production of sintered, non-consumable,
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fes contains.
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It has proven to be particularly advantageous, for example, to introduce the barium or strontium oxide into a thin-walled tube or tube made of a material that evaporates easily during sintering and to simultaneously press this filled tube or tube with the tungsten powder. It is also possible to arrange several souls in this way as oxides or as metal rods or wires made of emission-promoting substances in the tungsten electrode, whereby z. B. the weld seam width can also be significantly influenced.
Tests have shown that with direct current welding the focal point is fixed at the tip of the tungsten electrode and is so small that the effectiveness of the control metal or oxide as an emission-promoting substance is particularly evident at this point. Since the emitting substance is located at the point of contact during the direct current ignition process due to the production according to the invention, in addition to the advantages already described, the ignitability is also promoted quite considerably. This makes it possible to add the emission-promoting material to the tungsten in a significantly lower percentage that was previously considered impossible by experts than was previously required in the form of admixture or sheathing.
However, even with AC welding, the high-frequency ignition process is triggered much more reliably than was previously possible. In addition, the tungsten electrodes produced according to the invention achieve a significantly greater heat concentration, which means that the weld seam can not only be produced more quickly and narrower, but its appearance and structure are also significantly improved.
EMI2.1
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE237401X | 1961-08-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AT237401B true AT237401B (en) | 1964-12-10 |
Family
ID=5903074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT561062A AT237401B (en) | 1961-08-17 | 1962-07-11 | Process for the production of sintered, non-consumable, tungsten welding electrodes provided with control metals or oxides |
Country Status (1)
| Country | Link |
|---|---|
| AT (1) | AT237401B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2755213A1 (en) * | 1977-12-10 | 1979-06-13 | Duerrwaechter E Dr Doduco | Non-consumable tungsten electrode for arc welding in inert gas - where only the electrode tip contains addn. increasing electron emission |
-
1962
- 1962-07-11 AT AT561062A patent/AT237401B/en active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2755213A1 (en) * | 1977-12-10 | 1979-06-13 | Duerrwaechter E Dr Doduco | Non-consumable tungsten electrode for arc welding in inert gas - where only the electrode tip contains addn. increasing electron emission |
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