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DE2640506B2 - Gas mixture for the production of beard-free separating cuts during plasma cutting - Google Patents

Gas mixture for the production of beard-free separating cuts during plasma cutting

Info

Publication number
DE2640506B2
DE2640506B2 DE19762640506 DE2640506A DE2640506B2 DE 2640506 B2 DE2640506 B2 DE 2640506B2 DE 19762640506 DE19762640506 DE 19762640506 DE 2640506 A DE2640506 A DE 2640506A DE 2640506 B2 DE2640506 B2 DE 2640506B2
Authority
DE
Germany
Prior art keywords
gas mixture
plasma cutting
beard
volume
production
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE19762640506
Other languages
German (de)
Other versions
DE2640506A1 (en
DE2640506C3 (en
Inventor
Klaus Dipl.-Ing. 4000 Duesseldorf Baumgaertner
Herbert Dipl.-Ing. 6370 Oberursel Flasskamp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Priority to DE19762640506 priority Critical patent/DE2640506C3/en
Priority to AT0540677A priority patent/AT369305B/en
Priority to ES461629A priority patent/ES461629A1/en
Priority to FR7725332A priority patent/FR2364088A1/en
Priority to NL7709588A priority patent/NL7709588A/en
Priority to CH1087677A priority patent/CH637559A5/en
Publication of DE2640506A1 publication Critical patent/DE2640506A1/en
Publication of DE2640506B2 publication Critical patent/DE2640506B2/en
Application granted granted Critical
Publication of DE2640506C3 publication Critical patent/DE2640506C3/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K10/00—Welding or cutting by means of a plasma
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
    • B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Arc Welding In General (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Description

Die vorliegende Erfindung bezieht sich auf ein Gasgemisch zur Herstellung von bartfreien Trennschnitten beim Plasmaschneiden von niedriglegierten, kohienstoffarmen Stählen (Baustahl).The present invention relates to a gas mixture for producing beard-free separating cuts in plasma cutting of low-alloy, low-carbon steels (structural steel).

Beim Plasmaschneiden von Baustählen unter Verwendung der bisher üblichen Plasmaschneidgasgemische wie Argon, Argon-Wasserstoff-Gemisch, Luft sowie Stickstoff-Wasserstoff-Gemisch (s. DE-PS 12 31 093) etc. zeigt die Praxis, daß bartfreie Trennschnitte nicht beliebig oft reproduzierbar sind. Bei den meisten Plasmaschnitten dieser Art haftet an der Unterseite der Schnittkante geschmolzenes Material an, welches nur mittels eines zusätzlichen Bearbeitungsvorgangs (Schleifen, Hobeln etc.) entfernt werden kann. Dadurch wird jedoch das Plasmaschneiden von Baustählen unwirtschaftlich.When plasma cutting structural steels using the previously customary plasma cutting gas mixtures such as argon, argon-hydrogen mixture, air and nitrogen-hydrogen mixture (see DE-PS 12 31 093) etc. shows in practice that beard-free separating cuts cannot be reproduced as often as desired. Most plasma cuts of this type stick to the Molten material on the underside of the cutting edge, which only by means of an additional machining process (Grinding, planing etc.) can be removed. However, this makes the plasma cutting of Structural steels are uneconomical.

Um bartfreie Trennschnitte mittels eines Plasmaschneidbogens zu erreichen, ist es beispielsweise durch die US-PS 36 41308 sowie die DE-OS 2130 394 bekannt, den Plasmaschneidstrahl mit einem Wasserstabilisierungsmantel zu umgeben, wozu jedoch zusätzliche, kostenverursachende Einrichtungen notwendig sind.In order to achieve beard-free separating cuts by means of a plasma cutting arc, it is, for example, through US-PS 36 41 308 and DE-OS 2130 394 known to surround the plasma cutting beam with a water stabilization jacket, but for which additional, cost-generating facilities are necessary.

Aufgabe der vorliegenden Erfindung ist es, ein Plasmaschneidgasgemisch zu schaffen, mit dem ohne zusätzliche, den Plasmastrahl beeinflussende Medien bartfreie Trennschnitte erreichbar sind. Zur Lösung dieser Aufgabe wird gemäß der Erfindung ein Plasmaschneidgasgemisch mit folgender ZusammensetThe object of the present invention is to create a plasma cutting gas mixture with which without additional media influencing the plasma jet beard-free separating cuts can be achieved. To the solution This object is a plasma cutting gas mixture with the following composition according to the invention

zung vorgeschlagen:suggested:

80-35 Vol,-% Stickstoff
15-50 VoI.-% Neon
5-19Vol.-%Helium80-35% by volume nitrogen
15-50% by volume neon
5-19% by volume helium

Mit diesem Plasmaschneidgasgemisch werden überraschenderweise bartfreie Trennschnitte auch bei niedriglegierten, kohlenstoffarmen Stählen (Baustahl) erreicht, so daß zusätzliche Einrichtungen, wie es beimSurprisingly, beard-free separating cuts are also made with this plasma cutting gas mixture Low-alloy, low-carbon steels (structural steel) achieved, so that additional facilities, as it is at

ίο Plasmaschneiden mit Wasserstabilisierungsmantel der Fall ist, nicht mehr notwendig sind.ίο Plasma cutting with the water stabilization jacket Case is no longer necessary.

In Weiterbildung der Erfindung hat sich ein Gasgemisch als bevorzugt herausgestellt welches zusätzlich 1—5Vol.-% Wasserstoff enthält Untersuchungen haben ergeben, daß besonders vorteilhafte Schneidergebnis.se in bezug auf die Bartfreiheit und die Schneidgeschwindigkeit erreicht werden, wein der Stickstoffgehalt im Gasgemisch im Bereich von 60% bis 80% liegt, wobei dann der Neonanteil zwischen 15 und 30% und der Heliumanteil 5 bis 10% beträgtIn a further development of the invention, a gas mixture has been found to be preferred additionally contains 1-5% by volume of hydrogen, studies have shown that it is particularly advantageous Cutting results can be achieved in terms of beard freedom and cutting speed The nitrogen content in the gas mixture is in the range from 60% to 80%, with the neon content then between 15 and 30% and the helium content is 5 to 10%

Besonders vorteilhafte Schneidergebnisse in bezug auf die Beschaffenheit der Schnittkanten sowie in bezug auf die Arbeitsspannung haben sich bei einem Gasgemisch mit folgender Zusammensetzung herausgestellt: Particularly advantageous cutting results with regard to the nature of the cut edges as well as with regard to on the working voltage have been found for a gas mixture with the following composition:

75 VoL-% Stickstoff (N2)
16,8VoI.-% Neon (Ne)
5,6Vol.-% Helium (He)
2,5Vol.-% Wasserstoff (H2)75% by volume nitrogen (N 2 )
16.8 Vol .-% neon (Ne)
5.6% by volume helium (He)
2.5% by volume hydrogen (H 2 )

[Argon (Ar)
Rest < Sauerstoff (O2)[Argon (Ar)
Remainder < oxygen (O 2 )

[ Kohlendioxid (CO2) [ Carbon dioxide (CO 2 )

Dabei liegt der Sauerstoffanteil im Gemisch bevor-The oxygen content in the mixture is preferred

zugt unter 100 vpm. Mit einem derartigen Gasgemisch, werden insbesondere ι bezug auf die Arbeitsspannung sehr günstige Ergebnisse erreicht So wurde beispielsweise festgestellt, daß bei dem Schneiden von einem 10 mm dicken Baustahlblech (ST 37-2, ungeprimert) mitpulls below 100 vpm. With such a gas mixture very favorable results are achieved in particular with regard to the working voltage found that when cutting a 10 mm thick structural steel sheet (ST 37-2, unprimed) with

einer Geschwindigkeit von 1000 mm/min unter Verwendung einer von der Anmelderin unter der Bezeichnung PC 250-1 vertriebenen Plasmaanlage und einem unter der Bezeichnung PMC 250 von der Anmelderin vertriebenen Plasmaschneidbrenner, sowie einem Schneidstrom von 240 A die Arbeitsspannung nur 80 V betragen hat, gegenüber den sonst üblicherweise auftretenden 140VoIt. Damit wird durch das erfindungsgemäße Gasgemisch die Arbeitsspannung wesentlich herabgesetzt, was insbesondre im Hinblicka speed of 1000 mm / min using one of the applicant under the Designation PC 250-1 sold plasma system and one under the designation PMC 250 by the Applicant sold plasma cutting torch, as well as a cutting current of 240 A the working voltage only 80 V compared to the 140VoIt that usually occurs. Thus, by the invention Gas mixture significantly reduces the working voltage, which in particular with regard to

w auf die gültige Schutzbestimmung gegen zufällige Berührung besonders vorteilhaft ist. Durch das Gasgemisch wird somit das gesamte Plasmaschneidverfahren in bezug auf die Berührungsgefahr sicherer. Darüber hinaus wird durch die Spannungsreduzierung gleichzeitig auch die erforderliche Schneidenergie herabgesetzt, so daß auf Grund des erfindungsgemäßen Plasmaschneidgasgemisches die erforderliche Energie zum Schneiden gegenüber bisher geringer ist.w on the valid protection against accidental contact is particularly advantageous. Through the gas mixture the entire plasma cutting process is therefore safer with regard to the risk of contact. In addition, the voltage reduction also increases the cutting energy required reduced, so that the required energy due to the plasma cutting gas mixture according to the invention for cutting is lower than before.

Claims (3)

Patentansprüche:Patent claims: 1. Gasgemisch zur Hersteilung von bartfreien Trennschnitten beim Plasmaschneiden von niedriglegierten, kohlenstoffarmen Stählen (Baustahl), g e kennzeichnet durch folgende Zusammensetzung: 1. Gas mixture for the production of beard-free separating cuts during plasma cutting of low-alloy, low-carbon steels (structural steel), marked with g e by the following composition: 80-35 VoL-% Stickstoff
15-50 Vol.-% Neon
5-19VoI.-%HeIium80-35% by volume nitrogen
15-50% by volume neon
5-19% helium 2. Gasgemisch nach Anspruch 1, dadurch gekennzeichnet, daß das Gasgemisch 1 —5 VoL-% Wasserstoff enthält.2. Gas mixture according to claim 1, characterized in that the gas mixture is 1-5% by volume of hydrogen contains. 3. Gasgemisch nach Anspruch 1 und 2, gekennzeichnet durch folgende Zusammensetzung:3. Gas mixture according to claim 1 and 2, characterized by the following composition: 75VoL-% Stickstoff (N2)
16,8VoL-% Neon (Ne)
5.5Vo!.-% He!ium(He)
2,5Vol.-% Wasserstoff (H..)75VoL-% nitrogen (N 2 )
16.8VoL-% neon (Ne)
5.5Vo! .-% He! Ium (He)
2.5% by volume hydrogen (H ..) [Argon (Ar)
Rest ^ Sauerstoff (O2)[Argon (Ar)
Remainder ^ oxygen (O 2 ) [Kohlendioxid (CO2)[Carbon dioxide (CO 2 )
DE19762640506 1976-09-09 1976-09-09 Gas mixture for the production of beard-free separating cuts during plasma cutting Expired DE2640506C3 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE19762640506 DE2640506C3 (en) 1976-09-09 1976-09-09 Gas mixture for the production of beard-free separating cuts during plasma cutting
AT0540677A AT369305B (en) 1976-09-09 1977-07-25 GAS MIXTURE FOR THE PRODUCTION OF BEARD-FREE SEPARATE CUTS IN PLASMA CUTTING
ES461629A ES461629A1 (en) 1976-09-09 1977-08-16 Procedure for obtaining separation cuts without rebound in low alloy steels of little carbon content. (Machine-translation by Google Translate, not legally binding)
FR7725332A FR2364088A1 (en) 1976-09-09 1977-08-18 PROCESS FOR MAKING CUTS WITHOUT BARBS ON PLASMA CUTTING MACHINES
NL7709588A NL7709588A (en) 1976-09-09 1977-08-31 PROCEDURE FOR OBTAINING BURR-FREE SEPARATION CUTS IN PLASMA CUTTING.
CH1087677A CH637559A5 (en) 1976-09-09 1977-09-06 Method of making burr-free severing cuts in plasma-cutting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762640506 DE2640506C3 (en) 1976-09-09 1976-09-09 Gas mixture for the production of beard-free separating cuts during plasma cutting

Publications (3)

Publication Number Publication Date
DE2640506A1 DE2640506A1 (en) 1978-03-16
DE2640506B2 true DE2640506B2 (en) 1980-04-24
DE2640506C3 DE2640506C3 (en) 1981-01-22

Family

ID=5987479

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19762640506 Expired DE2640506C3 (en) 1976-09-09 1976-09-09 Gas mixture for the production of beard-free separating cuts during plasma cutting

Country Status (6)

Country Link
AT (1) AT369305B (en)
CH (1) CH637559A5 (en)
DE (1) DE2640506C3 (en)
ES (1) ES461629A1 (en)
FR (1) FR2364088A1 (en)
NL (1) NL7709588A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4977305A (en) * 1989-04-03 1990-12-11 L-Tec Company System for low voltage plasma arc cutting
CN105618926B (en) * 2016-02-29 2018-04-03 上海十三冶建设有限公司 The system inflation welding method of stainless steel pipes in Large Air Separation Devices ice chest

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2884510A (en) * 1955-10-17 1959-04-28 Union Carbide Corp Constricted arc apparatus and process
FR1449716A (en) * 1965-06-02 1966-05-06 Soudure Autogene Francaise Protective atmosphere for arc welding and surfacing of steels
US3582604A (en) * 1969-01-17 1971-06-01 David Grigorievich Bykhovsky Method of plasma treatment of metals
US3619549A (en) * 1970-06-19 1971-11-09 Union Carbide Corp Arc torch cutting process

Also Published As

Publication number Publication date
FR2364088A1 (en) 1978-04-07
DE2640506A1 (en) 1978-03-16
FR2364088B1 (en) 1982-08-20
DE2640506C3 (en) 1981-01-22
NL7709588A (en) 1978-03-13
AT369305B (en) 1982-12-27
ATA540677A (en) 1982-05-15
ES461629A1 (en) 1978-06-16
CH637559A5 (en) 1983-08-15

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Legal Events

Date Code Title Description
OD Request for examination
C3 Grant after two publication steps (3rd publication)
8339 Ceased/non-payment of the annual fee