PRODUCT TYPE : THE ULTIMATE ELECTRODE FROM DURA-METAL FOR MAINTENANCE AND REPAIR WELDING OF ALL STEELS WHEN MAXIMUM SECURITY IS EXPECTED WELDING TECHNIQUES
DESCRIPTION : S 688 EX1
APPLICATIONS : Due to exceptional strength and crack resistance, it is ideal for repairing tools, dies, spring steel,high tensile, axles, shafts, crack sensitive alloy steels and any dissimilar or unknown steel grades combinations. It is also recommended for repairing worn parts and as an underlay prior hardfacing.
TYPICAL CHEMISTRY :
MICROSTRUCTURE : A duplex austenite / ferrite structure with about 40% ferrite.
CHARACTERISTICS : Stable arc and low heat input electrode.No spatter, superior control and stability weld. Heat,impact, corrosion and friction resistant. Low heat input minimize changes to the base metal and its special flux formulation eliminates slag inference in horizontal fillets. Produces high bond strength and excellent quality weld.
WELDING TECHNIQUES : The area in which the weld is to be made should be free of rust, grease, paint and other materials which cause weld contamination. A 90ยบ vee joint should be used when joining heavy sections. Maintain a short arc length and use stringer beads.
RECOMMENDED AMPERAGE [ DC Reverse polarity ( Electrode +) or AC ] :-
Diameter (mm
|
1.6
|
2.0
|
2.5
|
3.2
|
4.0
|
5.0
|
Min. Amps
|
25
|
30
|
35
|
60
|
75
|
130
|
Max. Amps
|
35
|
55
|
70
|
110
|
140
|
200
|
MECHANICAL PROPERTIES :
Tensile Strength : 130, 000 PSI Work Harden 185, 000 PSI
Yield Strength : 95,000 PSI
Elongation : 35 %
Hardness : 21 RC
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