The Revolution for Welded Constructions: HiFIT Post­Weld Treatment

The HiFIT process

HiFITHigh Frequency Impact Treatment – is a high ­frequency peening process. Thanks to targeted post­weld treatment considerably increases the operational stability and the service life of dynamically loaded welded steel constructions. The HiFIT treatment is applicable universally, at a low cost of introduction. The HiFIT treatment delivers results every time that can be easily reproduced and offers the possibility of quality surveillance. Within the frame of a joint project promoted by the German Federal Ministry for Education and Research (BMBF) the HiFIT treatment samples through comprehensive fatigue tests, have proven that the treatment is particularly efficient.

The HiFIT device has been designed by DYNATEC Gesellschaft für CAE und Dynamik mbH.

HiFIT belongs to the "peening processes". In many publications it is known as HFMI (high frequent mechanical impact)

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The advantages of the HiFIT post­weld treatment are impressive, and lead to an enormous increase in the cost­effectiveness of your welded constructions:

An 80 % to 100 % increase in the weld fatigue strength

  • Due to local reshaping the weld toe is plastically deformed and reinforced.
  • Residual compressive stresses prevent the formation of cracks as well as the progression of cracks on the surface.

5­fold up to 15­fold increase in the service life of the weld

  • More than 1000 tests have proven that the service life is increased.

Equally effective for existing constructions

  • In case of timely restoration of existing constructions there is almost no distinction from new treated welds. Hence the service life of existing construction is considerably increased.
  • HiFIT is an ideal restoration tool as far as no macroscopically discernable cracks are evident.

Use of high­quality steels becomes economically relevant

  • Comprehensive theoretical and experimental analysis on Notch Details and FEM ­supported dimensioning processes show that the treatment is increasingly efficient with increasing tensile strength of fine­grained steels like S460N, S690QL, and of steels with even higher tensile strengths.
  • Consequently the use of steels with higher strength becomes interesting for lighter construction types. Higher steel grades improve the effectiveness of a HiFIT treatment.

Simple handling thanks to low weight and easy guidance

  • Also mobile compressors can also be used outside manufacturing plants.
  • The compact construction and the low weight permits access to hard­to­reach spaces. The space required is only slightly larger than the space required by a welding torch.
  • Robust LED lights on the head of the device provide optimal light conditions even under difficult circumstances.

Process reliability

  • The treated zone can be visually inspected.
  • The treatment line can be measured with a special calliper.
  • The working pressure can be monitored with a digital display in the handle.