2-274
Description
Basic electrode, for joint welding of dissimilar joints, problem steels and for repair and maintenance.
Very popular electrode for numerous applications. The weld metal offers exceptionally
high ductility and elongation together with outstanding crack resistance. There is no fear of
embrittlement when operating down to service temperatures of -110 °C or above +500 °C. The
scaling resistance goes up to +850 °C. When working at service temperatures above +650 °C
please contact the supplier. The weld metal can be post weld heat treated without any problems.
The deposit will work harden and offers good resistance against cavitation. Ductility is
good even after high dilution when welding problem steels or when subjected to thermal shock
or scaling. An excellent alloy providing cost effective performance.
Approvals and Certificates
TÜV-D (06786.), DNV (E 18 8 MnB), GL (4370), LTSS, VUZ, PRS (4370), SEPROZ, CE
Base Materials
For fabrication, repair and maintenance!
Dissimilar joints, tough buffer and intermediate layers prior to hardfacing, 14 % manganese
steels, 13 - 17 % chromium heat resistant steels up to +850 °C, armour plates, high carbon
and quenched & tempered steels, surfacing of gears, valves, turbine blades etc.
Typical Composition of All-weld Metal
C Si Mn Cr Ni
Wt-% 0.1 0.7 6.5 18.8 8.8
EN 1600:1997: E 18 8 Mn B 2 2
AWS A5.4-06: E307-15 (mod.) BÖHLER
FOX A 7
SMAW basic electrode, high-alloyed,
special applications
Same Alloy Filler Metals
SMAW electrode: FOX A 7-A Metal cored wire: A 7-MC
GTAW rod: A 7 CN-IG GMAW flux cored wire: A 7-FD, A 7 PW-FD
GMAW solid wire: A 7-IG SAW combination: A 7 CN-UP/BB 203
Mechanical Properties of All-weld Metal
(*) u
Yield strength Re N/mm2 (MPa): 460 (≥ 390)
Tensile strength Rm N/mm2 (MPa): 660 (≥ 620)
Elongation A (L0 = 5d0) %: 38 (≥ 335)
Impact work ISO-V KV J + 20 °C: 90 (≥ 380)
- 110 °C: (≥ 332)
(*) u untreated, as-welded
Operating Data
re-drying if necessary: ø mm L mm amps A
120 - 200 °C, min. 2 h 2.5 300 55 - 175
electrode identification: 3.2 350 80 - 100
FOX A 7 E 18 8 Mn B 4.0 350 100 - 130
5.0 450 140 - 170
6.0 450 160 - 200
Preheating and interpass temperature as required by the base metal.
Dissimilar Joints and Special Applications – SMAW Covered Electrodes
www.boehler-welding.com