For welding class high tensile steels GL-78

Item code : GL-78 Description : GL - 78 is a Base type covered electrode for all position welding. GL-52 is added a bit quantity of Mn, Si, Rare-earth..

GL - 78

Good welding - Low carbon

TCVN 3223–2000 E513B

TCVN 6259–6: 2003 MW53

AWS E7018/ JIS D5016

1. Đặc điểm và ứng dụng:      
   
  • GL - 78 is an iron powder low hydrogen type covered electrode with excellent usability in all position welding.
  • GL- 78 is suitable for high tensile strength carbon and alloyed steel in ships, bridges, building, and pressure vessels. 
  • It's easy-slag-removable, few blowhole, smoke and spatter. Its weld bead is smooth, shinny; the arc is soft, the re-striking is good and penetration is shallow...especially having perfect result with AC current.

2. Typical chemical composition of (deposited) all-weld-metal (%):

C

Mn

Si

P

S

0.12 max

1.0 ~1.60

0.40 ~ 0.60

0.028 max

0.028 max

3. Typical mechanical properties of all-weld-metal:

Tensile Strength
(MPa)
Yield Strength
(MPa)
Elongation
(%)
Impact Value ( J)
-29oC ( J )
500min
410min
22min
50min

4. Size available, recommended currents (AC&DC):

Size ( mm )
Ø3.2
Ø4.0
Ø5.0
Lengthi    ( mm )
350
400
400
Welding Current Range
(Ampe)
F
100 –150
180–230
190 –240
V & OH
80 –120
120 – 160
140 – 180

5. Usage introduction:

  • Dry the electrodes at 300-350oC for 30-60 minutes before use.
  • Adopt the backstep method or strike the arc on a small steel plate prepared for this particular purpose to prevent blowhole at the arc starting.
  • Keep the arc as short as possible
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