induction annealing

Induction Annealing Brass Bullet Shells

Induction Annealing Brass Bullet Shells Heating Treatment UHF Series With Induction Heating System   Application Note Objective:  A manufacturer of brass bullet shells wants to upgrade their existing induction heating equipment and is looking for improved efficiency. The goal of this application test is to demonstrate that the DW-UHF-6KW-III induction system will meet and exceed its requirements for achieving improved heating times and maintaining heat uniformity within … Read more

Induction Annealing Copper Tubes

Objective Uniformly high frequency annealing copper tubes simultaneously to 800°F (426°C) in under 10 seconds with induction heating. Equipment DW-HF-45kw induction heater Helical coil Material • Two copper tubes – OD: 0.69’’ (1.75 cm) – ID: 0.55’’ (1.40 cm) – Length: 5.50’’ (14.0 cm). Key Parameters Power: 27kW Temperature: 842°F (450°C) Time: 5 sec Process: … Read more

Induction Annealing Stainless Steel Wire

Objective Induction Annealing stainless steel wire in under 1 second with induction. Equipment DW-UHF-10kw induction heater Test I Material Stainless steel Rectangular wire 0.25’’ (6.35mm) Width 0.04’’(1.01mm) Thickness 3.5’’ (88.9mm)Length Key Parameters Power: 5 kW Temperature: 1300°F (704°C) Time: 1 sec Test II Materials Stainless steel Rectangular wire 0.6’’ (15.24mm) Width 0.08’’ (2.03mm) Thickness 1”  (25.4mm) … Read more

Induction Annealing Copper Tubes

Simultaneously Induction Annealing Copper Tubes Objective Uniformly heat two copper tubes simultaneously to 800°F (426°C) in under 10 seconds with induction heating. Equipment DW-HF-45kw induction heater Helical coil Material • Two copper tubes – OD: 0.69’’ (1.75 cm) – ID: 0.55’’ (1.40 cm) – Length: 5.50’’ (14.0 cm). Key Parameters Power: 35kW Temperature: 842°F (450°C) … Read more

What is induction annealing?

What is induction annealing?
This process heats metals that have already undergone significant processing. Induction annealing reduces hardness, improves ductility and relieves internal stresses. Full-body annealing is a process where the complete workpiece is annealed. With seam annealing (more accurately known as seam normalizing), only the heat-affected zone produced by the welding process is treated.
What are the benefits?
Induction annealing and normalizing delivers fast, reliable and localized heat, precise temperature control, and easy in-line integration. Induction treats individual workpieces to exact specifications, with control systems continuously monitoring and recording the entire process.
Where is it used?
Induction annealing and normalizing is widely used in the tube and pipe industry. It also anneals wire, steel strips, knife blades and copper tubing. In fact, induction is ideal for virtually any annealing task.
What equipment is available?
Each DAWEI Induction annealing system is built to satisfy specific requirements. At the heart of each system is
an DAWEI Induction Heating generator that features automatic load matching and a constant power factor at all power levels. Most of our delivered systems also feature custom-built handling and control solutions.

induction annealing tube

Induction Annealing Aluminum PIpe

Induction Annealing Aluminum PIpe With High Frequency Induction Heating Machine

Objective Annealing aluminum fuel tank fill neck to 650 ºF (343 ºC)
Material Aluminum fill neck 2.5” (63.5mm) diameter, 14” (35.5cm) long
Temperature 650 ºF (343 ºC)
Frequency 75 kHz
Equipment •DW-HF-45kW induction heating system, equipped with a remote workhead containing eight 1.0μF capacitors for a total of 2.0μF
• An induction heating coil designed and developed specifically for this application.
Process An eight turn helical is used to heat the tube for annealing. To anneal the full length of the tube, the tube is placed in the coil and heated for 30 seconds then rotated and the bottom half is heated for an additional 30. The tube is then bent while hot to prevent cracking.
Results/Benefits Induction heating provides:
• High efficiency, low energy cost
• Fast, controllable and repeatable process
• Prevention of cracks
• Hands-free heating that involves no operator skill for manufacturing
• Even distribution of heating

 

 

Induction Annealing Copper Wire

Induction Annealing Copper Wire

Objective: Induction Annealing a brazing copper wire for preform production.

Material: Copper Nickel Silver 2774 Alloy rod 0.070″ (1.8mm) diameter.

Temperature 650ºF(343.3ºC)

Frequency 580 kHz

Equipment: • DW-UHF-6kW-III induction heating system equipped with a remote workhead with one 1.0 μF capacitor, and a 4-20 mA input controller to aid in voltage ramping. • An induction heating coil designed and developed specifically for this application.

Process A unique helical coil consisting of four consecutive coils connected in parallel with a quartz tube lining is used to heat the wire to 650ºF (343.3ºC) for annealing.

Results/Benefits Induction heating provides: • Higher productivity of 27′ (8.2m) per minute • Reduction in surface oxidation & scaling • Consistent, repeatable results

Annealing Metal Stamp With Induction

Annealing Metal Stamp With Induction

Objective: Induction Heating the opposite end of a metal stamp so that it mushrooms instead of cracks/splits when struck by a hammer.

Material S-7 steel of varying rectangular cross sectional sizes

Temperature 1400-1800 ºF (760-982) ºC

Frequency 300 kHz

Equipment DW-UHF-10KW, induction heating system, equipped with a remote heat station containing two 1.5 μF capacitors for a total of 0.75 μF and three different induction heating coils designed and developed specifically for this application.

Process One five-turn and two four-turn helical coils are used to heat the end of stamps to the required temperature. Two part sizes can be run in each of coils, using the same machine settings except for cycle time. Cycle rates dependent upon the crosssection size. The 3/8″ (0.9525 cm) square size is has a rate of below 10 seconds. The rate for the middle size, ½” – 1 ½ ” (1.27 – 3.81 cm) is 30 to 60 seconds. A 1″ (2.54 cm) square part takes approximately two minutes. Fixturing can influence the length of the cycle time required. For shorter heat times a larger power supply may be used.

Results/Benefits Precise heat only to the area that needs annealing is more efficient and repeatable than heating with a torch.

 

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