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JL-M312
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ISO 14343 B SS312
AWS A5.9 ER312

Application

Used for welding cast alloys with similar compositions, and can also be used for carbon steel and stainless steel (Especially high-nickel stainless steel).

Characteristics

The Welding Wire is a 29%Cr-9%Ni series austenitic-ferrite duplex Stainless Steel Welding Wire. Even diluted by a large amount of austenitic-forming elements, it still retains the duplex structure and therefore has high crack resistance. It can be welded in all positions.

Chemical composition of welding wire: (Mass fraction)%

ItemCMnSiCrNiMoPSCu
Standard≤0.151.00-2.500.30-0.6528.00-32.008.0-10.5≤0.75≤0.030≤0.030≤0.75

Mechanical Properties of Deposited Metal

ItemTensile StrengthRm/MPaElongation A/%
Standard≥660≥22
Test Result68030

Note

For MIG welding, the shielding gas flow rate should be maintained at 18-25 L/min using Ar+2%O2 mixture. Wind shields must be employed when wind speed exceeds 0.5 m/s.

For TIG welding:

Gas flow rate should be 5-14 L/min at welding currents between 15-200 A Gas flow rate should be 14-24 L/min at welding currents between 200-320 A

Pure argon must be used as shielding gas. Wind shields are required when wind speed exceeds 1.0 m/s.

Pre-welding requirement: Both MIG and TIG welding processes require thorough removal of rust, oil, moisture and other contaminants from workpieces.

Note: The above parameters serve as reference only. Users shall establish suitable welding procedures based on specific production conditions.

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