DETAILS
Has been micro-alloyed to be capable of exceeding impact values of 68 J (50 ft·lbf) @ -29°C (-20°F). It is recommended for hot, fill and cap pass welding of up to X80 grade pipe.
Features
- Vertical down hot, fill and cap pass welding of up to X80 grade pipe
- Capable of producing weld deposits with impact toughnesss exceeding 122 J (90 ft·lbf) at -40°C (-40°F)
- ProTech® hermetically sealed packaging
Service Information
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BEFORE USE, READ AND UNDERSTAND THE SAFETY DATA SHEET (SDS) FOR THIS PRODUCT AND SPECIFIC INFORMATION PRINTED ON THE PRODUCT CONTAINER. SDS Search page
CONFORMANCE
CONFORMANCES | SPECIFICATION | CLASSIFICATION |
---|---|---|
AWS | AWS A5.29 | E81T8-G |
AWS | AWS A5.36 | E81T8-A4-K12 |
MECHANICAL PROPERTIES
Classification | Polarity |
Yield Strength @ 0.2% Offset
MPa (ksi) |
Tensile Strength
MPa (ksi) |
Elongation
% |
Charpy V-Notch
J (ft-lbs) @ -30°C (-20°F) |
Charpy V-Notch
J (ft-lbs) @ -40°C (-40°F) |
Hardness Rockwell B |
---|---|---|---|---|---|---|---|
E81T8-G Requirement | DC- | 470 (68) min. | 550-690 (80-100) | 19 min. | Info. Only | ||
E81T8-A4-K12 Requirement | DC- | 470 (68) min. | 550-690 (80-100) | 19 min. | 27 (20) min. | Info. Only | |
Typical Result, As-welded | DC- | 490-560 (70-81) | 550-630 (80-91) | 20-29 | 52-301 (38-222) | 94-167 (69-123) | 92 |
Typical Result, As-welded | DC+ | 520-540 (76-78) | 590-610 (86-88) | 20-26 | 94-235 (69-174) |
DEPOSIT COMPOSITION
Classification | Polarity | %Al | %B | %C | %Cr | %Cu | %Mn | %Mo | %Ni | %P | %S | %Si | %V |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
E81T8-G Requirement | DC- | 1.8 max. | Info. Only | 0.30 min. * | 0.50 min. * | 0.20 min. * | 0.50 min. * | 0.030 max. | 0.030 max. | 1.00 max. | 0.10 min. * | ||
E81T8-A4-K12 Requirement | DC- | 1.8 max. | 0.15 max. | 0.20 max. | 1.50 - 2.75 | 0.50 max. | 0.75 - 2.00 | 0.030 max. | 0.030 max. | 0.80 max. | 0.05 max. | ||
Typical Result | DC- | 0.7-1.2 | 0.0014 max. | 0.01-0.03 | 0.04-0.07 | 0.04-0.07 | 2.21-2.56 | 0.02 max. | 1.04-1.22 | 0.006-0.015 | 0.003 max. | 0.12-0.15 | 0.003 max. |
Typical Result | DC+ | 1.0-1.2 | 0.001 max. | 0.01-0.02 | 0.05-0.06 | 2.27-2.46 | 0.01-0.02 | 1.12-1.15 | 0.008-0.010 | 0.003 max. | 0.12-0.14 | 0.003 max. |
TYPICAL OPERATING PROCEDURES
Diameter | Polarity |
CTWD
mm (in.)⁽¹⁾ |
Wire Feed Speed
m/min (in/min) |
Voltage
volts |
Approx. Current
amps |
Melt-off Rate
kg/hr (lb/hr) |
Deposition Rate
kg/hr (lb/hr) |
Efficiency
% |
---|---|---|---|---|---|---|---|---|
1.7mm (0.068 in) | DC- | 19 (3/4) | 1.7-3.8 (70-150) | 16-22 | 165-250 | 1.4-3.1 (3.1-6.8) | 1.1-2.5 (2.5-5.5) | 78-81 |
2.0 mm (5/64 in) | DC- | 19 (3/4) | 1.7-3.3 (70-130) | 17-20 | 195-295 | 1.8-3.5 (4.0-7.6) | 1.5-2.9 (3.3-6.4) | 82-83 |
NOTES
Note |
---|
* To meet the requirements of a "G" classification, the chemical composition of the weld deposit must meet the minimum requirement for one or more of these elements. |
⁽¹⁾ For electrical stickout (ESO) subtract 6.4 mm (1/4 in) from contact tip to work distance (CTWD). |