Que hàn thép VD-7018-A1

Liên hệ

  • Welding low Mo alloy steel
  • Under the load up to 550 Mpa
  • Suitable for process furnace, burner, etc.
  • The welded joints operate at 4000

Applied standards: 

  • ASME/AWS: A5.5 E7018-A1

Characteristics – applications: 

  • VD-7018-A1 is the electrode under the group of low hydrogen. Metal is supplemented with molipden, so the welded joints are high-temperature. Welding slags are easily blistered and cleaned without splashing and explosion.
  • Suitable for welding low-alloy steel having Mo content up to 0.65% under 490 – 550 (Mpa) load and working at high temperature such as process furnace, burner, thermoelectricity, etc.

Chemical composition (%):

C Mn Si P S Mo
Required    ≤ 0.12 ≤ 0.9 ≤ 0.6 ≤0.03 ≤0.03 0.4~ 0.65
Obtained    0.06 0.85 0.48 0.02 0.009 0.5

Mechanical property of weld metal:

Yield strength
(Mpa)
Tensile strength
(Mpa)
Elongation
(%)
Impact value
(J)
Heat treatment
(0C xh)
Required ≥ 400 ≥ 490 ≥ 25 Not required 620±15 x1
Obtained 580 660 26 620±15 x1

Instructions for use:

  • Clean oil, grease and dust before welding
  • Dry the electrode at 300 ~350 C for 30 ~60 minutes before welding
  • Process welding edges as regulated
  • Select appropriate welding current to avoid possible defects
  • Lining weld beads should use a Ø3.2 electrode.
  • Use AC or DC± power
  • Size of the electrode and used current:
Diameter (mm) Ø 3.2 Ø 4.0 Ø 5.0
Length (mm) 350 400 400
Amperage (A) Flat welding 100~140 140~180 180~220
Vertical welding & Bare welding 80~120 120~160 160~200