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aerospace industry are subject to very
stringent requirements regarding precision
and dimensional accuracy, hence
specially designed forming and fabrication
equipment is used at BUTTING. Also
during forming specific material properties
and surface conditions are taken into
account.
In 1990 the family business received the
order for the pipe work to the engine of
the ARIANE 5 – main stage as semi-finished
products. In 1992 ERNO-Raumfahrttechnik
placed an order for the prototype
production and subsequent series production
of the complete piping system for
the ARIANE 5 – upper stage EPS. The
prefabrication of these sets had to be
highly consistent as to the geometrical
Piping component for the fuel feedlines
in ARIANE 4, PAL BOOSTER,
grade 1.4571, size 168 × 1.7 mm
(with bellows)
Piping component with pyro valve and
burst disk for the residual gas emission
in the fuel system of ARIANE 5,
EPS-upper stage, in grades 1.4544.9,
1.4546.9, Z4CMN21-06-09, dimension
12 × 2.0 mm
Model of the space station ISS
(Photograph by courtesy of Astrium)
Tanks and feedlines for test equipment P4.2 for DLR, Lampoldshausen
Contact:
Friedrich Schulze
Project Manager
Phone: +49 5834 50-206
E-Mail: friedrich.schulze@butting.de
4
BUTTING
AIRCRAFT & T H E P R O D U C T S AEROSPACE INDUSTRY
Piping components
The production of the piping components
is based on the customer’s drawings and
specifications. Appropriate quality plans
and testing plans are prepared by our
qualified and experienced staff.
There are also stringent requirements for
the surface condition of the final product.
Hence adequate testing is imperative (e. g.
by endoscope) to prove freedom from
particles and non-metallic inclusions on the
inside surface. The results of the testing
regarding surface conditions and roughness
values, especially in the weld area, are
documented.
Dimensional accuracy is one of the special
features of these components besides
most stringent requirements for the quality
of the weld. Generally quality of the
weld acc. to DIN 29 595 (aircraft and
aerospace industry – fusion welded metallic
components – technical requirements)
class 1 is prescribed. Considerable testing
is therefore required to prove the quality,
e. g. hydrostatic testing, helium leakage
test and dye penetrant testing (see also
chapter on Quality Assurance).
Valid approvals acc. to DIN 19 591 for
fusion welding are necessary to qualify
for the production of a weld. BUTTING is
approved by the SLV Schweißtechnische
Lehr- und Versuchsanstalt (Institute of
welding and research). The welders must
be qualified acc. to DIN 29 591, all available
at BUTTING.
Engineering
A further challenge for BUTTING is the
production of the ARIANE 5 ESC-A
Equipped lines, including the engineering.
BUTTING will also be solely responsible
for the material requisition (semi-finished
Piping component used as aircraft
drain pipe for Airbus, Drainmast, material
grades 1.4544.9, 1.4546.9, size
12 × 0.5 mm/3/8”
Piping component used as pressure
gas and refueling line in ARIANE 4,
PAL BOOSTER, material grade 1.4571,
size 88 × 4.0 mm/83 × 1.7 mm (with
bellow)
Piping component used as emission
device in the fuel system of ARIANE
5, EPS-upper stage, material grade
1.4544.9, 1.4546.9, size 22 × 1.0 mm/
16 × 2.0 mm
Piping component for the ARIANE 5
main stage EPC, in material grade
1.4435, elbow size 191 x 3.0 mm, 90°,
made of two halves
products, e. g. pipes, flat products, bars,
machining tools and flexible tubes) in accordance
with the high purity and quality
standards.
Welding
The welding of stainless steel pipes requires
• selection of processes preventing ingress
of oxygen
• selective heat input
• root protection
ARIANE 5 ESC-A upper stage, elbow
97 × 3.5 mm, material grade 1.4435
• shrink stresses and heat stresses must
be taken into account
• most careful weld edge preparation
(freedom from grease and dirt)
Besides various welding processes used
for the production of longitudinally
welded pipes (e. g. Submerged Arc Welding,
Laser Welding) BUTTING also uses
TIG orbital welding in a closed welding
system for diameters from 3.0 mm and
above, or qualified manual welding for the
production of piping components requiring
　
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