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  • Low hydrogen & Low Alloy Steel Electrodes
  • E7018
  • E7018-1
  • E10018-M
  • E11018M
  • E12016G
APPLICATIONS :

The tough, crack-free weld metal of consistent radiographic quality renders E7018 welding electrodes suitable for welding of carbon steels in fabrication of machinery & equipment of a wide range, especially for structures which are designed for severe service conditions involving heavy stresses and dynamic loads. It finds numerous applications with grain-refined constructional steels having tensile strength in the range 500 to 600 N/mm2.

Typical application includes :

  •   Boilers
  •   Off-shore drilling rigs & platforms
  •   Frigates & submarines
  •   Rotary kiln shells
  •   Bridges
  •   Rail wagons & coaches
  •   Pumps and Compressors
  •   Pressure Vessels
  •   Blast furnace shells
  •   Machinery for earth moving & road building

CHARACTERISTICS :

E7018 welding electrodes represent a unique combination of numerous features which every welder and welding engineer look for on shop floor and at erection site :

  •   Ease of operation in all positions.
  •   Smooth and stable arc which is easy to strike & restrike, combined with low spatter and with due control on molten pool.
  •   Slag detachability with little effort.
  •   Finely rippled bead with regular profile.
  •   Welds of consistent X-ray quality.
  •   Weld metal which possess excellent mechanical properties and displays resistance to cracking caused by heavy stresses and / or hydrogen.
  •   A higher level of metal recovery at 110-115%.
  •   Resistance to moisture pick-up.
  •   For best result redry electrode at 300oC for one hour before use.

CHEMICAL ANALYSIS OF ALL WELDS DEPOSIT (%) :
C Mn Si S P
0.10 max 0.80 – 1.40 0.75 max 0.03 max 0.03 max

Hydrogen in weld metal: 4ml/100g.max.
(Mercury method)

ALL WELD MECHANICAL PROPERTIES :
  Ultimate Tensile Strength (N/mm2) Yield Strength (N/mm2) Elongation (L = 4d) % CVN Impact values at minus 30oC Joules
As Welded 540-610 460-510 25-30 40-80
After SR at 620oC/Soaking period up to two hrs 520-580 450-500 26-32 50-100

WELDING CURRENT RANGES & PACKING DATA FOR SIZES MANUFACTURED :
Dia (mm) 2.5 3.15 4.00 5.00 6.3
Length (mm) 350 450 450 450 450
Current (amp) DC+ or AC70V 80-100 100-140 140-190 190-250 250-320
Pieces per Carton 125 90 60 40 25

APPROVED BY : LRA, BV, ABS, DNV, IRS, BIS, RDSO, CIB(MAH), NPCIL, MN DASTUR & CO., UHDE INDIA LTD., TOYO ENGG, KVAERNER POWER GAS INDIA LTD., BAXCOUNSEL, PDIL, NTPC, L&T POWER, VADODARA, LANCO, ADANI, IOCL-NOIDA, L & T BHEL, THERMAX, ISGEC, BHPV, HPCL, RIL, ESSAR, HMEL-BATHINDA.

NOTE ON USAGE :
  •   Ensure that electrodes are dry. It is a safe practice to redry electrodes for 1 to 2 hours at 250-300oc and then to keep them in a holding oven maintained at 80oC-100oC, prior to use.
  •   Keep the arc as short as possible & control weaving within 2 ½ times the core wire diameter.
  •   Clean the weld area of any surface contamination.
  •   It is good practice to preheat the joint faces to about 100oC at the commencement of the working shift, especially in the morning, to expel moisture & any traces of oil / grease.

Hydrogen controlled, basic coated iron powder type electrode of outstanding quality.

APPLICATIONS :

It is an outstanding electrode designed for several stringent applications demands the best in terms of total weld quality. This unique electrode is capable of yielding welds which are of radiographic quality, combined with exceptionally high impact strength and crack resistance. Thus it is suitable for a very wide range of grain-refined steels having tensile strength in the range of 500 to 600 N/mm2, as well as difficult steels containing higher carbon or higher levels of sulphur and other impurities.

Typical application includes :

  •   Boilers
  •   Hortonspheres
  •   Off-shore drilling rigs & platforms
  •   Pressure Vessels
  •   Blast furnace shells
  •   Machinery for earth moving & road building
  •   Bridges
  •   Pumps and Compressors
  •   Penstocks
  •   Frigates & submarines
  •   Rotary kiln shells
  •   Rail wagons & coaches

CHARACTERISTICS :

It represents a unique combination of numerous features which every welder and welding engineer look for on shop floor and at erection site :

  •   Ease of operation in all positions.
  •   Smooth and stable arc which is easy to strike & restrike, combined with low spatter and with due control on molten pool.
  •   Slag detachability with little effort.
  •   Finely rippled bead with regular profile.
  •   Welds of consistent X-ray quality.
  •   Weld metal which possess excellent mechanical properties and displays resistance to cracking caused by heavy stresses and / or hydrogen. In particular, it displays good impact resistance at subzero temperatures down to minus 50oC.
  •   High levels of tensile and impact properties are retained even after prolonged S.R. at 620oC.

CHEMICAL ANALYSIS OF ALL WELDS DEPOSIT (%) :
C Mn Si S P
0.10 max 0.80 – 1.60 0.50 max 0.03 max 0.03 max

(Mn + Cr + Ni + Mo + V) = 1.75 % max

ALL WELD MECHANICAL PROPERTIES :

It meets all the tensile and impact test requirements of SFA 5.1 in as-welded condition and after SR at 620oC for one hour. Furthermore, following are the properties after SR of 620oC/5 hours as per relevant WCPI of BHEL, Trichy.

Ultimate Tensile Strength (MPa) Yield Strength At 0.2% offset (MPa) Elongation (L = 4d) % CVN Impact Values (Joules) at minus 46oC
540 min 410 min 23-28 30 min

Hydrogen in Weld metal: 4ml/100g.max (Mercury method)


WELDING CURRENT RANGES & PACKING DATA FOR SIZES MANUFACTURED :
Dia (mm) 2.5 3.15 4.00 5.00 6.30
Length (mm) 350 450 450 450 450
Current (amp) DC+ or AC 90V 80-100 100-135 140-190 180-250 250-320
Pieces per Carton 125 90 60 40 25
NOTE ON USAGE :
  •   Redry the electrodes at 300- 350oC for 1-2 hours, cool them to 100oC, and then keep them in a holding oven maintained at 80oC-100oC prior to use.
  •   Minimize heat input and control interpass temperatures below 150oC to obtain optimum tensile & impact properties.
  •   Keep the arc as short as possible & control weaving within 2 ½ times the core wire diameter.
  •   Clean the weld area of any surface contamination.
  •   It is good practice to preheat the joint faces to about 100oC at the commencement of the working shift, especially in the morning, to expel moisture & any traces of oil / grease.
APPLICATIONS :

E11018M welding electrodes is an ultra-low hydrogen electrode specially designed for welding of high strength steel (80kg/mm2) such as USS T-1 & WEL-TEN 80 and steels conforming to ASTM A 517. Weld metal combines the desired high level of UTS & YS with notch toughness of high order. Control of diffusible hydrogen in welds at ultra-low levels helps to prevent hydrogen induced cracks.

Typical application includes :

  •   Penstocks
  •   Pressure Vessels
  •   Cranes
  •   Bridges
  •   Submarines
  •   Machinery for earth moving & road building.
  •   Off-shore constructions and machinery.

CHARACTERISTICS :

E11018M welding electrodes represents a unique combination of numerous features which every welder and welding engineer look for on shop floor and at erection site :

  •   Ease of operation in all positions.
  •   Smooth and stable arc which is easy to strike & restrike, combined with low spatter and with due control on molten pool.
  •   Slag detachability with little effort.
  •   Finely rippled bead with regular profile.
  •   Weld metal which possess excellent mechanical properties and displays resistance to cracking caused by heavy stresses and / or hydrogen. In particular it displays remarkable impact resistance at subzero temperatures down to minus 51oC.
  •   A higher level of metal recovery at 100-105%.
  •   Resistance to moisture pick-up.

MATERIALS TO BE WELDED :
  •   HY 80 & similar Q & T low alloy steels used in naval constructions.
  •   High strength steels used in general engineering, with YS up to about 700 N/mm2, such as USSTI, N-A XTRA 70, Hystal 77, WEL-TEN80.

CHEMICAL ANALYSIS OF ALL WELDS DEPOSIT (%) :
C Mn Si S P Ni Mo Cr
0.9 max 1.30-1.80 0.60 max 0.02 max 0.02 max 1.5-2.50 0.25-0.50 0.04 max

Hydrogen in weld metal: 3ml/100g.max. (Mercury method).

ALL WELD MECHANICAL PROPERTIES :
Ultimate Tensile Strength (N/mm2) 0.2% Proof Stress N/mm2 Elongation
(L = 4d)%		 CVN Impact Values (Joules)
At +20oC At-51oC
760-850 680-760 20-25 80-130 30-60

Lateral Expansion at -51oC > 0.50 mm(20 mils)


WELDING CURRENT RANGES :
Dia (mm) 2.5 3.15 4.00 5.00
Length (mm) 350 450 450 450
Current (amp) DC+ or AC 90V 80-100 100-135 140-180 180-250
NOTE ON USAGE :
  •   For due control on diffusible hydrogen in welds and for achieving a high standard of radio graphic soundness;
    (a) Heat the electrodes at 400oC for one hour.
    (b) Allow them to cool to 100-150oC in the oven.
    (c) Store these electrodes in the same oven at not less than 100oC or transfer them to a holding oven maintained at 100-120oC for use directly from the oven.
    (d) Ensure that there is no chance of moisture pick-up at any stage.
  •   Keep the arc as short as possible & minimize weaving.
  •   Select preheat & interpass temperature of 100-150oC depending on grade of steel & plate thickness.
  •   Control heat input in the prescribed range for the steel used.
  •   Maximum interpass temperature is 200oC.
APPLICATIONS :

An electrode designed for joining or surfacing of Cr-Mo-Ni low alloy steels, quenched & tempered high strength steels of matching or similar alloy levels. Also suitable for :
a) High strength steel castings where weld metal properties have to match the parent material after normalizing followed by quenching & tempering.
b) HSLA steels having more than 800 MPa YS with matching strength levels combined with good notch toughness in the AW condition.

  •   Low alloy hot working tools
  •   Shearing blades
  •   Punches
  •   Stamping dies
  •   Steam turbine rotors for service temperatures up to 530oC.
  •   Submarine components
  •   Earthmoving equipment

CHEMICAL ANALYSIS OF ALL WELDS DEPOSIT (%) :
C Mn Si Cr Ni Mo S P
0.09 max 0.60 – 1.0 0.50 max 0.80-1.20 2.0-3.0 0.80-1.20 0.025 max 0.025 max

Hydrogen in weld metal: 5ml/100g.max. (Mercury method)

ALL WELD MECHANICAL PROPERTIES :
Condition Ultimate Tensile Strength (MPa) Yield Strength (MPa) Elongation
(L = 4d) %		 CVN Impact values at minus 30oC Joules
At +20oC At -40oC
As Welded 830 min 740 min 14-20 40-60 30-50
*After PWHT 750-850 500 min 16-22 80-100 -

(*) PWHT - Normalising 1 hr. at 920oC & cooling in air.
Tempering 1 hr at 700oC & cooling in air.


WELDING CURRENT RANGES :
Dia (mm) 2.5 3.15 4.00 5.00
Length (mm) 350 350 350 350
Current (amp) DC+ or AC70V 60-85 100-130 140-180 190-230
NOTE ON USAGE :
  •   For due control on diffusible hydrogen in welds and for achieving a high standard of radiographic soundness:
    a) Heat the electrodes at 400oC for one hour.
    b) Allow them to cool to 100-150oC in the oven.
    c) Store these electrodes in the same oven at not less than 100oC or transfer them to a holding oven maintained at 100-120oC for use directly from the oven.
  •   Keep the arc as short as possible & minimize weaving
  •   Select preheat & interpass temperature of 100-150oC depending on grade of steel & plate thickness.
  •   Control heat input in the prescribed range for the steel used.

This electrode specially designed to combine a high level of tensile and impact properties with radiographic quality and "very low" category of hydrogen content. This favourable combination renders suitable for welding of high strength low alloy steels, grain refined steels, quenched and tempered steels, having tensile strength upto 750 MPa, such as ASTM A 514.

APPLICATIONS INCLUDE :
  •   Penstocks
  •   Pressure Vessels
  •   Cranes
  •   Bridges
  •   Submarines
  •   Machinery for earth moving and road building
  •   Of shore constructions and machinery

CHARACTERISTICS :

It represents a unique combination of numerous features which every welder and welding engineer look for on shop floor and at erection site:

  •   Ease of operation in all positions.
  •   Smooth and stable arc which is easy to strike & restrike, combined with low spatter and with due control on molten pool.
  •   Slag detachability with little effort.
  •   Finely rippled bead with regular profile
  •   Welds of consistent X-ray quality.
  •   Weld metal which possesses excellent mechanical properties and displays resistance to cracking caused by heavy stresses and / or hydrogen. In particular, it displays remarkable impact resistance at subzero temperatures down to minus 51 °C.
  •   Higher level of metal recovery at 110-115%.

CHEMICAL ANALYSIS OF ALL WELDS DEPOSIT (%) :
C Mn Si Ni Mo S P V Cr
0.09 max 1.0-1.7 0.80 max 1.4 - 2.1 0.25 -0.50 0.025 max 0.025 max 0.025 max 0.3 max

Hydrogen in weld metal:4ml/100g.max. (Mercury method) Moisture in coating — 0.20% max.

ALL WELD MECHANICAL PROPERTIES :
Ultimate Tensile Strength (MPa) Yield Strength at 0.2% offset (MPa) Elongation
(L = 4d) %		 Elongation
(L = 5d) %		 CVN Impact values at minus 30oC Joules
690 min 610-680 20 min 18 min 30-60 at -51°C

Lateral Expansion at -51°C > 0.50 mm (20 mils)


WELDING CURRENT RANGES :

Current range (Amp) DC + or AC(90V)
2.50x350 - 80-100
3.15x450 - 100-130
4.00x450 - 140-180
5.00x450 - 180-250

NOTE ON USAGE :
  •   For due control on diffusible hydrogen in welds and for achieving a high standard of radio graphic soundness;
    a) Heat the electrodes at 400°C for one hour.
    b) Allow them to cool to 100 —150°C in the oven.
    c) Store these electrodes in the same oven at not less than 100°C or transfer them to a holding oven maintained at 100-120°C for use directly from the oven.
    d) Ensure that there is no chance of moisture pick-up at any stage.
  •   Keep the arc as short as possible & minimise weaving.
  •   Select preheat & interpass temperature of 100 — 150°C depending on grade of steel & plate thickness.
  •   Control heat input in the prescribed range for the steel used, especially for Q & T steels.

* For more information on Low Hydrogen electrodes, care in their storage & redrying, and need to prevent over drying, please refer to our two special booklets of notes (blue cover & pink cover) especially for controlling diffusible hydrogen in welds below 4m1/100 gm.