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Product name：KH-70-B
 
Classification：A5.13 / EFe7
 
 

  1. Weld metal is martensite structure with carbide and boride precipitates.
  2. It is unable to be machined and cut.
  3. High hardness is attainable with only one layer of weld metal. The impact resistance is inferior.
  4. It is used in severe metal-to-earth wear, such as repairing construction machines, scraper buckets and dredge pumps.

 

Welding Instruction
  1. Dry the electrodes at 300-350°C for 30-60 minutes before use.
  2. Preheat temperature should be ≥ 200°C and PWHT should be 600°C.
  3. Take the back-step method to prevent porosity at the arc starting.
  4. Use high tensile strength low hydrogen electrode for the buffer layer in multi-layer build-up and base metal with high hardenability.

 

Typical Chemical Composition of Weld Metal (wt. %)

C

Si

Mn

Cr

B

Mo

0.900

1.28

0.80

7.00

0.50

1.20

Typical Hardness of Weld Metal

        Hardness

Condition

Vicker’s hardness

（HV）

Rockwell’s hardness

（HRC）

Shore’s hardness

（HS）

Interpass temp.≤100°C

720

61

83

Continuous build-up

680

59

80

Size and Suggested Operating Range (AC or DC+)

Diameter x Length(mm)

3.2x350

4.0x350

5.0x350

6.0X400

Amp

80~120

120~170

160~210

200~280


No.8, Luke 3rd Rd., Luzhu Dist., Kaohsiung City 821, Taiwan (R.O.C.)      TEL:886-7-6955155      FAX:886-7-6955166

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