pneumatic impact treatment · > hobbacher a., iiw recommendations for fatigue design of welded...
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Pneumatic Impact Treatment
PITEC - the leading experts for HFMI & Fatigue-Improvment
PIT achieves either a high material saving potential or a significant increase in the fatigue-life of your products and facilitiesand this with less cost and at a higher level of reproducibility than conventional methods such as grinding,
TIG dressing, shot peening or post weld heat treatment.
A PIT treatment is just needed at the Hot-Spots of a construction.
PIT is the leading HFMI-System which…(HFMI = High Frequency Mechanical Impact)
a) …achieves a geometrical optimization of the notch at the weld toe
b) …overlays the tensile stresses at the surface with high compressive stresses
The result is a significant enhancement of the fatigue strength or fatigue life.
=>
The PIT-Effect
confirms the high effects of HFMI
e.g. from FAT 80 up to FAT 140 and more
Design Recommendations for HFMI
https://shop.deutscherstahlbau.de/de/dast-richtlinie-026https://www.springer.com/de/book/9789811025037
PIT vs. other methods
The comparison with other methods shows the high technical and economical potential of Pneumatic Impact Treatment (PIT) in an impressive way.
factors FAT-classes factors FAT-classes factors FAT-classes factors FAT classes
FAT 71 235 fy ≤ 355 1,30 FAT 90 1,57 FAT 112
> 355 fy ≤ 550 1,76 FAT 125
> 550 fy ≤ 750 1,97 FAT 140
> 750 fy ≤ 950 2,25 FAT 160
FAT 80 235 fy ≤ 355 1,30 FAT 100 1,56 FAT 125
> 355 fy ≤ 550 1,75 FAT 140
> 550 fy ≤ 750 2,00 FAT 160
> 750 fy ≤ 950 2,25 FAT 180
FAT 90 235 fy ≤ 355 1,30 FAT 112 1,55 FAT 140
> 355 fy ≤ 550 1,77 FAT 160
> 550 fy ≤ 750 2,00 FAT 180
> 750 fy ≤ 950 2,00 FAT 180
FAT classes
"as welded" details
Längssteife
Quersteife
Stumpfstoß
PITyield strength
fy
Grinding TIG Dressing Hammer-/Needle Peening
m=3 m=3 m=3 m=5
1,30FAT 100
FAT 100 1,30 FAT 1001,50
FAT 901,50
FAT 112
1,30 FAT 90
Referenzen:
> Hobbacher A., IIW recommendations for fatigue design of welded joints and components, WRC bulletin 520, New York: The Welding Research Council, 2009
> Marquis et al., Fatigue strength improvement of steel structures by high-frequency mechanical impact: proposed fatigue assessment guidelines, Weld World 57, pp. 803-822, 2013
> IIW Recommendations on High Frequency Mechanical Impact (HFMI) Treatment for Improving the Fatigue Strength of Welded Joints
1,30 FAT 112 1,30 FAT 1121,50 FAT 125
> high potential for bad treatment
- cross section reduction
- additional notches
> time-consuming
> only in horizontal level > low reproducible
> high hand-arm-vibration level
> highest improvement
> high reproducibility
> sustainable quality-assurance
> ~ 20 cm/min.
1,30
HFMI-much more than „just“a higher frequency
In October 2008, PITEC was founded in HeudorfThanks to state-of-the-art compressed air technology, the PIT system is not only lighter and cheaper than UIT, but also very practical and efficient thanks to the UIT experience of the PIT team.
In October 2018 acquire Hermann Fliess GmbH & Co the patent and namingrights of PITEC and establishes PITEC Deutschland GmbH. In order toexploit synergies,for example, in the common strength with regard to higher-strength steels.
The PIT effects Your benefits
• Substantially increased vibration resistance
• Prevention and/or avoidance of fatigue damage
• Also effective with retroactive use• Substantially more efficient than
conventional methods• Reduction of shrinking stress• Specific introduction of high residual
compressive stress
• Higher & more sustainable quality• Great lightweight construction potential• Better system availability, including on
existing systems• Substantial cost and time savings• Reduction and/or avoidance of warping• Prevention of stress corrosion• Increased safety
The leading HFMI experts:(HFMI = High Frequency Mechanical Impact)
the PITEC portfolio
PIT consulting
PIT operator training
PIT treatmentservice
PIT rental equipment
PIT Systems Sale
PIT qualityinspection
PIT consulting
PIT Systems Sale
PIT for repairs
We see repeatedly in research projects and industrial applications that PIT also achieves multiple prolongation of remaining lifespan.
If fatigue damage occurs in part of a machine or system…
a PIT-supported repair:
➢ the component is shut down, the crack points and the repair welded➢ the top layer of the repair seam is then treated with little effort using PIT➢ on a symmetrical component the opposite side, which has not yet cracked, is also treated
with PIT as a preventative measure
The remaining lifespan after this repair is generally much longer than the new component would have achieved without PIT.
a standard repair:
➢ the component is shut down, the crack pointed and the repair welded➢ however the opposite side of a symmetrical components will crack very soon as this side is
also ‘fatigued’.➢ because it can take a while until the second crack happens, depending on the load,
operation starts again and this costly procedure is repeated when the 2nd crack has formed.
=> The remaining lifespan after this kind of repair is generally ~50% of the new component
Our long time experience and the high efficiency of our PIT Systems allows us
to be the leading supplier of HFMI technology in this moment.
international pleased customers
HFMI – the advantages of PIT
the currently leadingHFMI method
most versatile application
widest range of accessories
full power at only 250 l/min
at 6 bar
probably the most experienced HFMI
team
sustainable quality concept
robust design for industrial application
very low hand-arm vibrations of just
~5m/s2
speeds:of 20 cm/min or 10 cm2/min
lighter & cheaper than ultrasonic-
systems but with an absolutely similar
effect
HFMI is more effective than
other methods
tolerancecompensation for
automated use
the highest range of applications
PIT treatment at weld toeavoid fatigue
PIT treatment of edgesavoid fatiugue
flat PIT treatment of every layeravoid shrinkage stress
& distorsion
flat PIT treatmentavoid fatigue and/or
Stress Corrosion Cracking SCC
by Hand
by Robot
under Water
till now only by PIT
Not every HFMI System is able to do
flat treatments
…let us convince you too!
created by Frank Schäfers at 6th August 2019
PITEC Deutschland GmbHEssenberger Straße 85-93D-47059 Duisburg
Sales-Office:Frank SchäfersSales & Technical ManagerTel: +49 (0)2272 9787557Fax: +49 (0)2272 9787559 Mobil: +49 (0)173 [email protected]
Consulting:Peter GersterSenior ConsultantMobil: +49 (0) 160 [email protected]
Thank you for your attention!