Lincoln Electric C2.410 manual Low Hydrogen Welding, E7018-1

Page 24

Low Hydrogen Welding

Low hydrogen electrodes are recommended for three broad areas of application:

1.On low alloy, high carbon, high sulfur, or other steels where cracking is a problem.

2.When specified by governing codes.

3.For lowest costs on vertical, overhead and horizontal groove welds on heavy (over 1/2”) plate.

Procedures

Vertical Up Groove Welds . . . . . . . . . . . . . . . page 27 Overhead Groove Welds . . . . . . . . . . . . . . . . page 27 Vertical Up Fillet Welds . . . . . . . . . . . . . . . . . . page 28 Overhead Fillet Welds . . . . . . . . . . . . . . . . . . page 28 Horizontal Groove Welds . . . . . . . . . . . . . . . . pages 29-30 Flat Fillet Welds . . . . . . . . . . . . . . . . . . . . . . . pages 31-32 Horizontal Fillet Welds . . . . . . . . . . . . . . . . . . pages 33-34

Recommended	Class
Jetweld LH-70	E7018
Jet-LH78 MR	E7018
Excalibur® 7018	E7018
Excalibur 7018-1	E7018-1

Jetweld LH-3800 (E7028) Techniques

Employ the same techniques for this High-Deposition electrode as recommended for E7024 electrodes. Clean the slag from every bead on multiple pass welds to prevent slag inclusions which would appear on X-ray inspection.

EXX18 Welding Techniques

Procedures and techniques for E7018 electrodes can be used for E8018, E9018, or E11018 Lincoln electrodes.

Polarity - Whenever possible use electrode positive for 5/32” and smaller electrodes. AC can be used at about 10% higher currents.

Use AC on 3/16” and larger diameter electrodes to minimize arc blow for best operating characteristics. DC+ can also be used at about 10% lower currents.

-24-

Image 24

Contents Stick Electrode Welding Guide Page Table of Contents Welding Procedures Out-Of-Position Welding Vertical and OverheadVertical Up Techniques for Fillet and Groove Welds Vertical Up Groove Welds Vertical Down WeldsVertical Up Fillet Welds 160 PolarityWeld High-Deposition Welding Jetweld LH-3800 E7028H8Wrong End view Side view Corner Welds Groove Welds Groove Welds First PassJetweld 2 E6027 Amps. AC at 14/Min Deep Groove Welds Joint a Pass E6011T Over E6011 Root PassesFlat Fillet Welds Plate Size T 14 ga 12 ga 10 ga No. of Passes Leg Size LFt. of Weld/Hr Lbs. of Elec./Ft. 049 082 117 162 WeldHorizontal Fillet Welds Welding Inclined Plate Downhill Angle deg Polarity Arc Speed In./Min.3 Lbs. of Elec./Ft.180 High Speed Welding Sheet Metal AlternatePage Edge Welds Fillet Welds Lap WeldsDiameter Position Current Amps 110 155 PolarityCurrent Amps 120 170 Polarity 018 028Burnthrough Spot Welds Roof Decking to Beam Roof Beam Flange Roof Deck Thickness 22 ga 20 ga 18 ga 16 gaLow Hydrogen Welding E7018-1Multipass Page Overhead Groove Welds Diameter Current Amps 155 PolarityOverhead Fillet Welds Also see Out-of Position Procedures, No. of Pass Leg Size LArc Speed In./Min Ft. of Weld/Hr Lbs. of Elec./Ft. No. of Passes Leg Size LHorizontal Groove Welds Back gouge first bead as needed Plate Size T No. of PassesDiameter Current Amps 230 200 Polarity Arc Speed In./Min Ft. of Weld/Hr Lbs. of Elec./Ft. of WeldUse steel backing as on 230 200 PolarityWith E7028 Electrode With E7018 Electrode 275 350132 195 272 409 727 260 335 157 236 320Ft. of Weld/Hr.2 Lbs. of Elec./Ft. 203 335785 Minimum Preheat and Interpass Temperature1 Stick Electrode Typical Operating Procedures Out-of-Position GroupHigh Deposition Group High Speed GroupLow Hydrogen Group Low Hydrogen, Low Alloy Steel GroupFleetweld Jetweld Fleetweld 5P Shield-Arc Fleetweld 5P+Fleetweld Fleetweld 35LS Jetweld Shield-Arc 70+ Shield-Arc HYP+Electric Shock can kill Fumes and Gases can be dangerous For Electrically powered Electric and Magnetic Fields Stick C2.410 12/04