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Welding joint between Steel to Mild Steel

 

2. Welding between Steel to Mild Steel

We here talking about different metal welding work (Dissimilar metal welding joint).
In thermal plant some areas application where we must need to weld two dissimilar metal.

We all know that Mild steel less costly rather than Stainless steel
but in some areas where we need hard and long time rubbing structure we required than we made from stainless steel and for reducing cost of structure we use both material sheet to together Mild Steel sheet and Stainless steel.

For jointing Mild Steel with Stainless steel we use 309 Welding Rod





Application-







We using stainless steel with mild steel structure in coal feeder areas , coal pipe on band, Steel valve welding flange with mild steel etc. 

Electrode 309 ESAB

ESAB 309 is specially designed for the welding of AISI 309 type steels, straight chrome steels dissimilar steels for e.g. welding of mild steels to stainless steels, low alloy steel to stainless steels etc. It is also used for surfacing and building up of components to improve its wear resistance.

TYPICAL ALL WELDMETAL PROPERTIES

Chemical Composition (%)

Mechanical Properties

C

0.08

Ni

13.0

UTS

610 N/mm2

M n

1.50

Si

0.40

YS

480 N/mm2

Cr

  23.0

P

0.020

EL (L=4d)

37%

S

0.015

 

 

 

 

CURRENT RANGE & PACKING DATA

Size (mm)

Length (mm)

Current Range (Amps)

No. of Electrodes in a

Carton

Cardboard box

2.50

350

40-60

80

400

3.15

350

60-90

65

325

4.00

350

85-130

40

200

5.00

350

140-180

30

150

ESAB 309 is a basic, all position electrode depositing a 25/12-type weld metal which is extremely resistant to corrosion and oxidation at elevated temperatures of up to 1100°C. ESAB 309 welds with a very smooth and quite arc in all positions with a very low spatter. The slag is easily detachable and the final weld bead is smooth, finely rippled and shiny. Welds are of radiographic quality.


3. Stainless steel to Stainless steel welding rod-





When we going to weld Stainless steel to Stainless steel structure or Mechanical joint generally for this purpose use we use welding electrode E308L

Electrode E308L

E308-16 is designed for welding of the following 18-8 stainless steel types: 301, 302, 304 and 308. The weld deposit has the proper chemical content and balance for satisfactory welding of type 308, and therefore is suitable for welding 18-8 types of lower alloy content. Sound weld metal and corrosion resistance equal to or greater than that of the parent metal are assured.

NOMINAL COMPOSITION

Carbon .04% max           Chromium 18.0-21.0%
Nickel 9.0-11.0%            Manganese .5-2.5 % 
Copper .75% max.          Silicon .90% max
Phosphorus .04% max.   Sulfur .03% max
Molybdenum .75% max. Iron Balance
Normal Ferrite Range 4-10

TYPICAL MECHANICAL PROPERTIES AS WELDED:
Yield Strength (psi) 64,000     Elongation 46%    Tensile Strength (psi) 84,000 

4.Hard Facing welding electrode


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