312 Stainless Steel TIG Rods

312 Stainless Steel TIG Rods 

312 stainless steel TIG rods (classified as ER312) are high-alloy filler metals designed for welding dissimilar steels, difficult-to-weld materials, and unknown grades. With a unique chemical composition featuring very high chromium and nickel levels, 312 rods produce a weld deposit with exceptional strength, crack resistance, and versatility, making them a preferred choice for repair, maintenance, and heavy fabrication work. Supplied in 5Kg packs.

Why Use 312 Stainless TIG Rods?

Exceptional Crack Resistance

312 TIG rods are known for their outstanding resistance to hot cracking and weld metal failure. The weld deposit forms a high-strength austenitic-ferritic (duplex-like) structure, which helps absorb stresses caused by:

• High restraint joints

• Rapid cooling rates

• Dissimilar metal expansion differences

This makes 312 one of the most forgiving and reliable fillers for challenging welding conditions.

Ideal for Dissimilar and Unknown Steels

312 rods are widely used for welding:

• Stainless steel to carbon or alloy steel

• Tool steels and spring steels

• High carbon steels

• Unknown or mixed material grades

Their high alloy content tolerates dilution from different base metals, maintaining weld integrity where standard fillers (e.g. 308L or 309L) may not perform reliably.

High Strength Weld Deposits

312 filler metal produces welds with very high tensile strength (often exceeding 700 MPa), significantly higher than standard stainless fillers. This makes it suitable for:

• Structural repairs

• Load-bearing components

• Heavy-duty fabrication

The weld metal retains toughness while offering increased resistance to mechanical stress and impact.

Excellent for Repair and Maintenance

Because of its versatility and tolerance to contamination, 312 TIG rods are commonly used in repair environments where material composition or condition may not be fully known. They perform well on:

• Worn or damaged components

• Hardened or heat-treated steels

• Components with limited pre-cleaning

Good Heat and Wear Resistance

312 weld metal offers improved resistance to:

• Heat and oxidation

• Abrasion and wear

• Thermal cycling

This makes it suitable for applications involving elevated temperatures or mechanical wear, such as tooling and industrial equipment.

Stable TIG Welding Characteristics

Despite its high alloy content, 312 rods provide good TIG welding performance:

• Smooth, stable arc

• Good wetting and fusion

• Controlled weld pool

• Clean bead appearance

These characteristics allow for precise welding even in demanding applications.

Typical Applications

• Dissimilar metal welding (stainless to mild or alloy steel)

• Repair of tool steels and high carbon components

• Maintenance welding in industrial environments

• Hard-facing and wear-resistant overlays

• Fabrication where material grade is unknown