REFURBISHMENT

Welding Services

HTS IC is operating Welding Services for general refurbishment of industrial components. Weld-surfacing alloy is carefully selected based on operating parameters and failure mechanism, so that refurbished component often lasts longer than original one.

REFURBISHMENT

Refurbishment Of Die Casting Componets

Die casting components such as shot sleeves are exposed to extreme in-service loading that at certain point deteriorates their working surface. For their efficient use the bore hole is generally refurbished by turning to bigger diameter. This changes their dimensional and thermal conditions as well as offsets die-casting machine operating parameters.

Complete or partial reconstruction of shot sleeve inner surface (example is repair of shot sleeve pour zone), or refurbishment of other components like die cores, to its original functional geometry with equal or improved mechanical properties, is performed utilizing specially developed CNC weld-surfacing technology. Selection of special alloys is available that provide best solution for particular failure mechanisms.

Proposed refurbishment services return the product to its original dimensional state while assuring its optimum material properties. Such refurbishment can be repeated several times to maximize return from products utilized.

Refurbishment Advantages
  • selection of surfacing alloy to optimize shot sleeve performance
  • constant diameter or diameter modification based on request
  • cost effectiveness
Refurbishment Material Selection

Refurbishment alloy can be selected:

  • as an alloy that corresponds to originally used material
  • to upgrade original material to higher resistance level based on alloy selection chart (see Table 1)
  • by determining prevailing failure mechanism using our laboratory service and then define optimum refurbishment alloy and process technology

Table 1: Surfacing alloy selection based on failure cause

Prevalent Failure Mechanism/
Applicable Alloy
High TemperatureThermal FatigueWear AbrasionWear Corrosion

HTS-WA*

3

1

5

3

HTS-WX1

3

2

4

2

HTS-WX2

3

3

2

2

HTS-HT

5

4

3

4

HTS-TF

4

5

3

4

Number 1 indicates poor performance, whereas number 5 indicates excellent performance
*applicable only to limited exposed areas

High temperature
In cases with high working temperature and possible material overheating that results in tempering of steel, reduction of its hardness, and consequently development of conditions that assist premature failure.
APPLICABLE TO
Shot sleeves used for high weight castings; high volume shot sleeves (diameter and length); where molten material is applied into sleeve with pressure to one specific point, which result in local overheating; for thin wall shot sleeves; for core dies exposed to intense flow of molten metal causing overheating.

Thermal fatigue
In cases where high temperature gradients occur in material in repetitive cycles, developing detrimental thermal fatigue conditions.
APPLICABLE TO
Shot sleeves with cooling circuits; thin cooled sections, as for example cooling of thin-wall shot sleeve underneath the pour zone; casting pistons front end; and generally for parts with high temperature difference in wall section.

Wear abrasion
In cases where hard particles or media penetrate the sleeve material and dig material from the sleeve leaving a depression or groove.
APPLICABLE TO
Casting of highly abrasive aluminum alloys. Call for specification of casting alloys.

Wear corrosion
Degradation of shot sleeve material in which both corrosion and wear mechanisms are involved. The combined effects of wear and corrosion can result in total material losses much greater than the additive effects of each process taken alone.
APPLICABLE TO
Casting of abrasive aluminum alloys with particular chemical composition and application temperature, all in combination with shot sleeve material. Call for specification of casting alloys and casting conditions.