AS DA-778

Askaynak

Ürün Broşürü (PDF)

General Description

AS DA-778 is a basic coated electrode particularly used for the welding of steels containing 5 % Cr and 0.5 % Mo. The weld metal has a crack resistance to operating temperatures up to 550°C. Since it is a low hydrogen electrode, the weld metal has a high creep resistance. It has about 110 % metal recovery. It is recommended to use the electrode in DC (+).

 

Classification and Typical Weld Metal Composition

EN 1599 : E CrMo 5 B 42
AWS A5.5 : E8018-B6
C Si Mn Cr Mo  

0,05

0,50

0,70

5

0,50

 

 

Mechanical Properties of the Weld Metal, Typical

Yield Strength : 400 (N/mm²)    
Tensile Strength : 580 (N/mm²)    
Elongation (L=5d) : 22 (%)    
Impact (ISO-V)
: 80 (Joule) (+20°C)  
 

Approvals and Certificates

Certificates

GOST

SEPRO

TSEK

 

Applications and Materials to be Welded

Power plant constructions; flange pipes used in petrochemical plants; forged cast parts, vapor production plants, preheaters and heaters, boiler and pressure vessels and pipe connections are among some application areas where AS DA-778 is used. It can also be used in welding similarly alloyed cementation steels, heat treatable steels and cast steels.

Part should be preheated to 300°C before welding and operating temperature during welding should not exceed 350°C.  

Creep Resistant Steels :
DIN: 15 CrMo 3 (1.7205)
DIN: 25 CrMo 4 (1.7218)
DIN: 15 CrMo 5 (1.7262)
DIN: 22 CrMo 4 4 (1.7350)
DIN: 12 CrMo 19 5 (1.7362)
EN: X12 CrMo 5
Cast Steels :
DIN: GS-17 CrMo 5 5 (1.7357)
EN: G-17 CrMo 5 5
DIN: GS-25 CrMo 4 (1.7218)
EN: G25CrMo4
DIN: GS-22 CrMo 5 (1.7252)
EN: G22CrMo5
DIN: GS-22 CrMo 5 4 (1.7354)
EN: G22CrMo5-4
DIN: GS-12 CrMo 19 5 (1.7363)
EN: G-X 12 CrMo 19 5
Cementation Steels :
DIN: 15 Cr 3 (1.7015)
EN: 16MnCr5
EN: 20MnCr5
 

Welding Parameters / Packing and Diameter Informations

Current Type and Polarity : DC (+)

Diameter
(mm)
Length
(mm)
Current
(Amper)
Electrode Weight
(g/100 pcs)
Quantity
(pcs/box)
Weight
(kg/box)
2.50 350 75 - 100 2300 200 4,6
3.25 350 90 - 140 3640 135 4,9
 

Welding Positions

 

Ürün Broşürü (PDF)