Application

Vacuum pumps for electron beam and vacuum welding

In electron beam welding, the component lies in a vacuum chamber: the electron beam needs the vacuum, and without air the seam remains free of pores and oxide. Atlas Copco describes vacuum welding with little oxygen and nitrogen so that the seam does not oxidise; Busch names pore-free welds. Below you can see how the application works, what vacuum the manufacturers name and which of their series are intended for it ā€“ 175 models from 4 manufacturers.

Compare 175 modelsHow it works

  • 175Models
  • 9Series
  • 4Manufacturers
  • 4Industries
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Touch the points: each part of the system explains itself.

In short

Electron beam and vacuum welding: the key facts

  • No oxidationAtlas Copco: little Oā‚‚ and Nā‚‚ in the chamber so that the seam does not oxidise ā€“ in low to high vacuum.
  • Pore-free seamsFor electron beam welding, Busch names pore-free welds and the COBRA, PANDA/PUMA and R5 series (in the product finder).
  • Series namedPfeiffer Vacuum names DuoVane, HiLobe and HiScroll as well as the COMBI family; Leybold lists DRYVAC and SCREWLINE for welding technology, Edwards EXS for electron beam and plasma welding.
  • Laser weldingBecker names the extraction of burn-off in laser welding without naming a series.
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  • Air and gas (vacuum)
  • Exhaust

Operating principle

How it works: Electron beam and vacuum welding

The drawing shows the basic principle in section. The systems and pumps of the individual manufacturers differ in detail.

  1. LoadingThe component is placed in the chamber and clamped, and the chamber closes.
  2. EvacuatingThe pumping station evacuates the chamber until the chamber pressure is reached ā€“ according to Atlas Copco with little Oā‚‚ and Nā‚‚ so that the seam does not oxidise.
  3. WeldingThe electron beam welds the seam in vacuum ā€“ according to Busch without pores. The chamber is then vented and unloaded.

Vacuum and sizing

Electron beam and vacuum welding: how much vacuum is needed

What the manufacturers say about pressure, pumping speed and sizing.

What vacuum

For vacuum welding, Atlas Copco names low to high vacuum without stating a pressure figure.

Pumping station

The chamber is evacuated again after each loading; for this, Pfeiffer Vacuum names the COMBI family alongside DuoVane, HiLobe and HiScroll. Which combination fits depends on chamber size and cycle time.

Burn-off and metal vapour

Becker names the extraction of burn-off in laser welding; separators or filters upstream of the pump retain metal vapour and burn-off.

Which pumps

Busch names COBRA, PANDA/PUMA and R5 (in the product finder), Pfeiffer Vacuum DuoVane, HiLobe and HiScroll, Leybold DRYVAC and SCREWLINE, Edwards EXS. Atlas Copco and Becker name the application without a series.

Technology

Electron beam and vacuum welding: the vacuum pumps the manufacturers name

Listed are the series the manufacturer itself names for this application. ā€œShow only ā€¦ā€ sets the filter of the product overview.

Atlas Copco names the application without naming a series for it. Becker names the application without naming a series for it.

Product overview

Electron beam and vacuum welding: all 175 models compared

Use the filters on the left to narrow the selection ā€“ by manufacturer, technology and the modelsā€™ key figures, for 50 or 60 Hz.

Busch COBRA Industry series 36 models

COBRA NS 0070 CPumping speed 70 mĀ³/h 50 Hz85 mĀ³/h 60 HzUltimate pressure 0.03 mbarRated motor power 4 kW 50 Hz4.4 kW 60 HzVariants
COBRA NC 0100 BPumping speed 110 mĀ³/h 50 Hz130 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 3.5 kW 50 Hz4.8 kW 60 HzVariants 4
COBRA NC 0100 B ECOTORQUEPumping speed 130 mĀ³/h 50 Hz130 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 4.8 kW 50 Hz4.8 kW 60 HzVariants
COBRA NS 0160 CPumping speed 135 mĀ³/h 50 Hz170 mĀ³/h 60 HzUltimate pressure 0.03 mbarRated motor power 5.5 kW 50 Hz6.6 kW 60 HzVariants
COBRA NC 0200 BPumping speed 220 mĀ³/h 50 Hz265 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 6 kW 50 Hz7.6 kW 60 HzVariants 4
COBRA NC 0200 B ECOTORQUEPumping speed 265 mĀ³/h 50 Hz265 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 7.6 kW 50 Hz7.6 kW 60 HzVariants
COBRA NC 0300 BPumping speed 320 mĀ³/h 50 Hz385 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 7.5 kW 50 Hz9.5 kW 60 HzVariants 4
COBRA NC 0400 BPumping speed 350 mĀ³/h 50 Hz420 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 7.5 kW 50 Hz9.5 kW 60 HzVariants
COBRA NX 0450 APumping speed 350 mĀ³/h 50 Hz420 mĀ³/h 60 HzUltimate pressure 0.1 mbarRated motor power 7.5 kW 50 Hz9.5 kW 60 HzVariants
COBRA NC 0300 B ECOTORQUEPumping speed 385 mĀ³/h 50 Hz385 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 9.5 kW 50 Hz9.5 kW 60 HzVariants
COBRA NC 0400 B ECOTORQUEPumping speed 420 mĀ³/h 50 Hz420 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 9.5 kW 50 Hz9.5 kW 60 HzVariants
COBRA NX 0450 A ECOTORQUEPumping speed 420 mĀ³/h 50 Hz420 mĀ³/h 60 HzUltimate pressure 0.1 mbarRated motor power 11 kW 50 Hz11 kW 60 HzVariants
COBRA NC 0500 BPumping speed 490 mĀ³/h 50 Hz490 mĀ³/h 60 HzUltimate pressure 0.01 mbarRated motor power 9 kW 50 Hz9 kW 60 HzVariants
COBRA NC 0630 C VRPumping speed 580 mĀ³/h 50 Hz680 mĀ³/h 60 HzUltimate pressure 25 mbarRated motor power 22 kW 50 Hz22 kW 60 HzVariants
COBRA NC 0600 CPumping speed 600 mĀ³/h 50 Hz600 mĀ³/h 60 HzUltimate pressure 0.01 mbarRated motor power 18.5 kW 50 Hz18.5 kW 60 HzVariants
COBRA NS 0600 CPumping speed 600 mĀ³/h 50 Hz600 mĀ³/h 60 HzUltimate pressure 0.01 mbarRated motor power 15 kW 50 Hz15 kW 60 HzVariants
COBRA NC 0630 CPumping speed 630 mĀ³/h 50 Hz630 mĀ³/h 60 HzUltimate pressure 0.01 mbarRated motor power 15 kW 50 Hz17 kW 60 HzVariants
COBRA NC 0630 C ECOTORQUEPumping speed 630 mĀ³/h 50 Hz630 mĀ³/h 60 HzUltimate pressure 0.01 mbarRated motor power 17 kW 50 Hz17 kW 60 HzVariants
COBRA DX 0650 A PLUSPumping speed 650 mĀ³/h 50 Hz650 mĀ³/h 60 HzUltimate pressure 0.1 mbarRated motor power 15 kW 50 Hz15 kW 60 HzVariants
COBRA NX 0650 APumping speed 650 mĀ³/h 50 Hz650 mĀ³/h 60 HzUltimate pressure 0.1 mbarRated motor power 12.5 kW 50 Hz15 kW 60 HzVariants
COBRA NX 0650 A ECOTORQUEPumping speed 650 mĀ³/h 50 Hz650 mĀ³/h 60 HzUltimate pressure 0.1 mbarRated motor power 15 kW 50 Hz15 kW 60 HzVariants
COBRA NF 0750 APumping speed 750 mĀ³/h 50 Hz750 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 15 kW 50 Hz15 kW 60 HzVariants
COBRA NC 1000 BPumping speed 840 mĀ³/h 50 Hz1,000 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 22 kW 50 Hz25 kW 60 HzVariants
COBRA DX 0950 A PLUSPumping speed 950 mĀ³/h 50 Hz950 mĀ³/h 60 HzUltimate pressure 0.01 mbarRated motor power 18.5 kW 50 Hz18.5 kW 60 HzVariants

Busch PANDA/PUMA series 26 models

Busch R5 series 58 models

Edwards EXS series 11 models

Leybold DRYVAC series 9 models

Leybold SCREWLINE series 2 models

Pfeiffer Vacuum DuoVane series 12 models

Pfeiffer Vacuum HiLobe series 17 models

Pfeiffer Vacuum HiScroll series 4 models

Model comparison

Models a manufacturer no longer carries in its current range are listed in its ā€œOutdated modelsā€ section.

Industries

Electron beam and vacuum welding: where the manufacturers name it

The manufacturers list these uses on their own pages.

Metallurgy and heat treatment

Busch, Edwards and Pfeiffer Vacuum list electron beam welding under metallurgy and heat treatment; Edwards also names plasma welding with EXS there.

Industry page: Metallurgy and heat treatment ā†’

Automotive and transport

Busch names electron beam welding for automotive and transport ā€“ pore-free welds with COBRA, PANDA/PUMA and R5; Pfeiffer Vacuum also lists it in this industry.

Industry page: Automotive and transport ā†’

Aerospace

Atlas Copco names vacuum welding for aerospace: little Oā‚‚ and Nā‚‚ so that the seam does not oxidise, in low to high vacuum.

Industry page: Aerospace ā†’

Mechanical engineering and manufacturing

For mechanical engineering, Becker names the extraction of burn-off in laser welding without naming a series.

Industry page: Mechanical engineering and manufacturing ā†’

Frequently asked questions

Electron beam and vacuum welding: frequently asked questions

How does electron beam welding in vacuum work?

The component lies in a chamber that is evacuated before welding; the electron beam then welds the seam. Busch names pore-free welds as the result, and Atlas Copco describes vacuum welding with little Oā‚‚ and Nā‚‚ so that the seam does not oxidise.

Why does electron beam welding need a vacuum?

The electron beam can only propagate undisturbed in vacuum, and without air no oxygen reaches the seam. Atlas Copco names little Oā‚‚ and Nā‚‚ against oxidation, Busch pore-free welds.

How much vacuum does a welding chamber need?

For vacuum welding, Atlas Copco names low to high vacuum without stating a pressure figure. The pump size depends on chamber size and cycle time.

Which vacuum pump for electron beam welding?

Busch names COBRA, PANDA/PUMA and R5, Pfeiffer Vacuum DuoVane, HiLobe and HiScroll as well as the COMBI family, Leybold DRYVAC and SCREWLINE, Edwards EXS. Atlas Copco describes vacuum welding without a series.

Oil-free or oil-lubricated for vacuum welding?

With DRYVAC and SCREWLINE, Leybold lists dry vacuum pumps for welding technology. Busch names the oil-lubricated R5 alongside COBRA and PANDA/PUMA, Pfeiffer Vacuum the oil-lubricated DuoVane alongside HiLobe and HiScroll ā€“ so both designs are named.

What is vacuum welding?

Welding in an evacuated chamber. Atlas Copco describes it for aerospace: little Oā‚‚ and Nā‚‚ so that the seam does not oxidise, in low to high vacuum.

Which vacuum pump for plasma welding?

Edwards lists EXS for electron beam and plasma welding without describing the processes in more detail.

How is burn-off extracted during laser welding?

Becker names the extraction of burn-off in laser welding as an application without naming a series or figures. Separators or filters upstream of the pump retain the burn-off.

Why a pumping station with a Roots pump?

A Roots pump increases the pumping speed in the medium vacuum range but needs a backing pump ā€“ this brings the chamber to working pressure faster after each loading. For electron beam welding, Pfeiffer Vacuum names the COMBI family alongside DuoVane, HiLobe and HiScroll.

Which series does Busch name for welding?

For electron beam welding, Busch names COBRA, PANDA/PUMA and R5 with pore-free welds, also in the product finder. On its metallurgy page, Busch lists welding with COBRA and PANDA/PUMA without describing it.

A single pump or a central vacuum system?

A central system in a room of its own keeps noise and heat away from production and matches its output to the demand. Central vacuum systems are planned and built by Eugen Theis Vakuum, a company of the Ehrler & Beck group ā€“ more under Central Vacuum.

Does Ehrler & Beck also supply spare parts and service?

Yes. Ehrler & Beck offers original spare parts and accessories as well as maintenance and repair.

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