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TL-78A1
(R106Fe )
Considerable: GB T5118 E5018-A1
AWS A5.5 E7018-A1
Coating: Iron powder low hydrogen type

Characteristics and Applications:

   TL-78A1 is an iron powder low hydrogen type electrode for 490N/mm2 high tensile steel.

 The weld metal contains 0.5% Mo, therefore it is suitable for chemical plants, petroleum refinery plants and other casting steels.

Notes on Usage:

1.Dry the electrodes at 350℃ for 60 minutes before use.

2. Preheat and interpass temperature at 150℃-250℃, and post weld heat treatment 620~710℃×1h.

Welding Position:
        

Typical Chemical Composition of Weld Metal (wt %):

 

C

Mn

Si

P

S

Mo

Test results

0.080

0.78

0.54

0.012

0.013

0.56

AWS Spec

≤0.12

≤0.90

≤0.80

≤0.035

≤0.035

0.40~0.65

Typical Mechanical Properties of Weld Metal:

 

YS(MPa)

TS(MPa)

EL(%)

PWHT

Test results

490

575

27

620℃x1hr

AWS Spec

≥390

≥490

≥22

620±15

Welding Parameters (AC or DC+):

Diameter and Length (mm)

3.2x350

4.0x400

5.0x400

Amps

F

90-130

140-190

190-240

V&OH

80-120

120-160

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