Technology panorama — Independent expertise — Advisory & integration

Weld-Hit
AB

Technology panorama — Independent expertise — Advisory & integration

Weld-Hit AB is a recognised player in its technology field. Kronos Engineering, as an independent special-processes expert, brings a neutral perspective on these solutions — audit, benchmarking, multi-technology integration. With no commercial bias toward any brand, we steer you to the technology that genuinely fits your use case.

Weld-Hit AB technologies — overview

Mastered technology

Pneumatic HFMI — weld toe treatment

Mastered technology

portable HFMI kit (hammer, air treatment unit, pins, gauges)

Operational alternative

HFMI field and workshop deployment

Typical use cases

▸ HFMI of offshore wind tower and foundation welds
▸ Life extension of welds on existing bridges and civil structures
▸ HFMI of highly loaded steel structures — cranes, lifting gear, mining equipment
▸ Fatigue crack repair — weld repair followed by HFMI treatment

Standards & compliance

IIW 2016DNV-RP-C203

The Kronos difference

Kronos Engineering does not distribute Weld-Hit AB equipment. Our expertise lies in special processes and their qualification — this neutrality is our guarantee of technical objectivity: we recommend what is genuinely best for your part, your standard, your production volume.

Context and positioning

Weld-Hit AB is a Swedish family-owned company, founded in 2017 and based in Rottne, specialising in HFMI (High Frequency Mechanical Impact), the high-frequency mechanical impact treatment that improves the fatigue strength of welded structures. According to the information published by the manufacturer, its equipment is pneumatic: it runs on compressed air (2 to 6 bar) and delivers around 100 impacts per second to the weld toe. The offer takes the form of a portable HFMI kit in a carrying case — a hammer with recoil damping, an air treatment unit for lubrication and intensity adjustment, impact pins in several radii and gauges to check treatment depth. The manufacturer highlights wind energy, offshore, bridges, mining equipment, steel construction and interrun peening for weld repairs.

Kronos Engineering, based in Bordeaux, applies HFMI every day and works on the same scope as an independent process expert. We do not distribute Weld-Hit equipment and have no commercial relationship with the manufacturer: our business is delivering the treatment on your welds, in the workshop or on site, inspecting it, documenting it and training your operators, within the framework of the IIW 2016 recommendations and your project's standards. We work directly or as a subcontractor, in more than 50 countries, and every quotation request is answered within 12 working hours.

Typical operations

HFMI on offshore wind welds

Weld toe treatment on towers, transition pieces and foundations — in the fabrication shop or on site, with procedure, settings, inspection and traceability file.

Existing bridges and civil structures

HFMI treatment of fatigue-sensitive welded details to extend the life of a structure in service — mobile crews, work at height, file handed over to the asset owner.

Fatigue crack repair

Weld repair of the cracked area followed by HFMI treatment of the new weld toe to delay crack re-initiation, on steel structures, lifting equipment and mining machinery.

Independent HFMI technology benchmark

Comparative test on a customer coupon between pneumatic, ultrasonic and electromechanical tools — footprint measurement, analysis and a reasoned recommendation based on the weld and the applicable standard.

HFMI operator training

Theory (weld fatigue, residual stresses, IIW 2016 recommendations) and hands-on practice (preparation, tool angle and travel speed, groove inspection, traceability), at your site or in Bordeaux.

Why Kronos on Weld-Hit AB

The treatment, not just the tool. An HFMI kit alone does not guarantee the fatigue gain: weld preparation, pin selection, tool angle, travel speed and groove inspection make the difference. Kronos applies HFMI to your welds and hands you a documented, inspected and traceable treatment.

Multi-technology HFMI expertise. Pneumatic, ultrasonic or electromechanical: we know the HFMI tool families and advise according to the weld, the steel, access and your project's standards — not according to a catalogue. We also run comparative coupon tests.

Site crews in 50+ countries. Heavy structures, work at height, offshore: we work directly or as a subcontractor, train your operators on site or in Bordeaux, and answer every quotation request within 12 working hours.

Frequently asked questions

Is Kronos a Weld-Hit distributor or partner?+

No. Kronos Engineering does not distribute Weld-Hit equipment and has no partnership with the manufacturer. To buy a kit or spare parts, contact Weld-Hit directly. Kronos works on the treatment itself: HFMI delivery on your welds, process expertise, inspection and operator training.

HFMI, UIT, HiFIT, PIT, high-frequency hammer peening: is it all the same thing?+

These terms refer to the same family of processes. HFMI (High Frequency Mechanical Impact) is the generic term adopted by the International Institute of Welding (IIW). UIT (Ultrasonic Impact Treatment) refers to ultrasonically driven tools, PIT (Pneumatic Impact Treatment) to pneumatic tools and HiFIT (High Frequency Impact Treatment) to another tool technology. The process is also called high-frequency hammer peening. In every case, an indenter strikes the weld toe at high frequency to smooth its geometry and introduce compressive residual stresses.

Which standards govern HFMI treatment?+

The reference is the IIW Recommendations for the HFMI Treatment (Marquis and Barsoum, 2016), which set out the conditions for application, inspection and crediting the fatigue improvement. Offshore, DNV-RP-C203 governs the fatigue design of steel structures and the improvement of welds by post-weld treatment. Kronos works within the framework of these documents and your project specification.

What fatigue improvement can be expected?+

The improvement depends on the steel, the weld quality, the detail and the loading. Rather than quoting a generic figure, we review your case against the IIW 2016 recommendations and tell you what can reasonably be credited, with coupon tests where needed.

Can Kronos treat welds on site, including offshore?+

Yes. Our crews work both in the workshop and on site — offshore wind, bridges, steel structures, lifting and mining equipment — directly or as a subcontractor, in more than 50 countries.

Do you provide HFMI operator training?+

Yes: theory (weld fatigue, residual stresses, IIW 2016 recommendations) and hands-on practice (preparation, settings, tool angle and travel speed, groove inspection, traceability), at your site or in Bordeaux.

How quickly can I get a quote?+

Every quotation request — treatment, expertise or training — is answered within 12 working hours. If possible, state the type of structure, the steel grade, the weld length to be treated and the work location.

Audit, operation or
Weld-Hit AB integration?

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