Heavy Lifting & Cranes

The Challenge in the Heavy Lifting and Cranes market
Steel is the most important construction material for cranes because of its load-carrying capacity, its favourable processing behaviour and its high efficiency in mobile crane engineering. The metal's properties can be adapted to suit the respective technical demands. High-strength steels used in mobile crane structures allow light weight designs that reduce capital costs and also operating costs. And it means that larger capacity mobile and crawler cranes are possible.
In mobile crane engineering the dead weight of the construction has a critical influence on the working load, and with that, on the efficiency of the mobile crane. Reducing the dead weight without losing load-bearing capacity (i.e. the strength and component safety of the construction) is a primary requirement.
Terrain cranes are part of the traffic on public roads they are subject to the motor vehicle construction and use regulations applicable in the countries where they operate and consequently are usually strictly limited with respect to axle loads and the permissible total weight. In spite of those weight and dimension limits, there is demand for continuously higher crane performance.
Demand is for the telescopic boom, carried by the crane within the admissible weight, to cover an increasingly large working area (both lifting height and radius) and so its length must be increased while maintaining or even reducing the construction weight.
Benefits of UIT
Fatigue is a big problem for crane manufactures because of the dynamic loads. UIT helps to increase fatigue life and/or fatigue strength. An higher fatigue strength makes it possible to construct the cranes with less material, saving both weight and money.
To maximise the advantages of high-strength steels in the case of fatigue loads, it appears that as few welds as possible should be placed in stressed areas of the construction. The fatigue-strength of welded joints can be improved with UIT. Even the fatigue-strength of the base material can be improved.
Typical applications
UIT can be used to enhance the fatigue life and reduce weight in many different crane components, such as:
  • Boom sections
  • Steel frames
  • Chassis
  • Rehabilitation of Heavy Hauel Crane Griders