E309LMo-15/16/17 Welding Rod
E309LMo-15/16/17 is a type of stainless steel stick welding rod that is known for its excellent corrosion resistance and high resistance to intergranular corrosion. Earlier E309LMo electrode was known as E309MoL rod.
The added molybdenum (Mo) in the composition of E309LMo welding rod makes it particularly well-suited for 316 clad steel welding, welding 316 to carbon steel/ low alloy steel and 316L weld overlay on carbon steel.
The addition of Mo & low carbon content in the E309LMo rod makes it more resistant to intergranular corrosion and pitting than standard 309 welding rods.
It is also a good choice for welding dissimilar metals such as carbon steel to stainless steel.
E309LMo rod has higher ferrite number compared to E309L type rod.
E309LMo-15/16/17 Welding Electrode Specification
E309LMo welding rod is typically manufactured and certified to meet the specifications set by the American Welding Society (AWS) in the AWS A5.4 standard.
The AWS A5.4 standard specifies the requirements for stainless steel electrode and filler wire for shielded metal arc welding.
The AWS A5.4 standard also includes specifications for the chemical composition, mechanical properties, and testing requirements for E309LMo welding rod.
This standard ensures that E309LMo welding rod meets a certain level of quality and consistency and can be trusted to perform well in various welding applications.
E309LMo-15/16/17 Welding Rod Chemical Compositions
The UNS Number of E309LMo welding electrode is W30923. The chemical composition of E309LMo welding rod as per AWS A5.4 specification is as follows:
| Chemical Element | Composition (%) |
| C | 0.04 max |
| Mn | 0.5- 2.5 max |
| Si | 1.00 max |
| P | 0.04 max |
| S | 0.03 max |
| Mo | 2.0-3.0 |
| Cr | 22.0-25.0 |
| Ni | 12-14 |
This table shows the typical chemical composition of E309LMo welding electrode.
Note: In terms of chemical composition and mechanical properties, E309Mo-15, E309Mo-16 and E309Mo-17 are same. The difference is in the usability characteristics, Click here to know in details.
E309LMo Welding Rod Mechanical Properties
The mechanical properties of E309MoL-16 welding rod include a minimum tensile strength of 75 ksi, a yield strength of 60 ksi, and an elongation of 30%.
These properties make E309MoL-16 welding rod an excellent choice for applications that require high strength and durability.
| Property | Value |
| Tensile strength | 75 ksi minimum (520 MPa) |
| Yield strength | Not specified in AWS A5.4 (typical value is 60 ksi) |
| Elongation | 30 % minimum |
| Impact toughness | Not specified in AWS A5.4 |
This table shows the typical mechanical properties of E309LMo welding rod.
E309LMo Welding Rod Polarity
When using E309LMo welding rod, it’s recommended to use the SMAW process with a DC & AC Polarity.
- E309LMo-15 can be used with DCEP polarity in all welding positions.
- E309LMo-16 can be used AC & DCEP polarity in all welding positions.
- E309LMo-17 can be used with AC & DCEP polarity in all welding positions.
- E309LMo-26 can be used with AC & DCEP polarity in Flat & horizontal positions only.
E309LMo Welding Rod applications
E309LMo welding rod is a versatile and popular choice for a wide range of applications, particularly those that require high corrosion resistance and strength. Some of the most common applications of E309LMo welding rod include:
- Joining dissimilar metals: E309LMo welding rod is particularly well-suited for welding dissimilar metals, such as carbon steel to stainless steel. The added molybdenum (Mo) in the composition improves the resistance to pitting and crevice corrosion, making it a good choice for these types of applications.
- Chemical, food and pharmaceutical industries: E309LMo welding rod is commonly used in the chemical, food, and pharmaceutical industries, as it offers excellent corrosion resistance and high resistance to intergranular corrosion.
- Maintenance and repair of equipment: E309LMo welding rod is also commonly used in the maintenance and repair of equipment in various industries, including chemical, food, and pharmaceutical, as well as in the marine and power generation industries.
- Welding low carbon stainless steels: E309LMo welding rod is also often used to weld low carbon stainless steels. In this case, the addition of Mo improves the resistance to intergranular corrosion, making it a good choice for welding low carbon stainless steels.
E309LMo Welding Rod Welding Parameters
When welding with E309LMo welding rod, it’s important to use the appropriate welding parameters to ensure a high-quality weld. The recommended welding parameters for E309LMo welding rod include:
- Current: E309LMo welding rod is typically used with a DC electrode negative polarity. A current range of 80-110 Amps is typically recommended for welding with 3/32 inches rod and 110-130 Amps for 1/8 inches rod.
- Voltage: A voltage range of 20-26 Volts is typically recommended for E309LMo welding rod.
- Travel speed: A travel speed of around 18-22 inches per minute (ipm) is typically recommended for E309LMo welding rod.
