AWS A5.28 ER90S-B3 MIG Welding Wire containing 2.5%Cr and 1% MO, is designed for welding low-alloy steels with high tensile strength and creep-resistant steels of similar composition. It is designed for prolong elevated temperature service up to 600℃ as well as suitable for pipelines in pressure vessels and steam generating power plant, such as boilers superheater, steam chest, valve body. The deposited metal has low impurity elements such as phosphorous (P), and sulfurous (S) to minimize tempering embrittlement.

MIG Welding Wire 

Characteristics and Application

Typical chemical Composition of Weld Metal (%)

Welding Positions:

Notes on usage:

1.Use DC-(DCEN) polarity and 100% Argon gas at proper flow rate (10-15 1/min, max. wind 1 m/sec).

2.Trailer Shield is required to ensure the weld pool completely shielded by inert gas until solidification is complete and no porosity problem.

3. Select right gas cup size and employ proper stick out of tungsten electrode.

4. Be sure to clean up the contaminations on the base metal and welding seam so as not to derogate the weld metal quality from particles.

5. To prevent cold cracking, preheating and interpass temperature should be 200-300℃

6. Postweld heat treatment should be 680-730℃ to remove residual stress.

7. Heat input should be properly controlled prevent from excessive heat input can cause hot cracking and,deteriorate tensile properties and notch toughness.

Typical Mechanical Properties of Weld Metal

C 0.09  Mn 0.61 Si 0.5  P 0.010  S 0.012 Cr 2.4  Mo 0.97 Cu 0.15

AWS A5.28 ER90S-B3

Yield strength 570MPa  Tensile Strength 650MPa  Elongation 25%  PWHT 690℃X1hr