Welding is a critical process where metals are joined together with the use of heat. It is a widely used method in various industries to craft quality products. While there are many welding techniques, Tungsten Inert Gas (TIG) and Metal Inert Gas (MIG) welding are the most popular. AWS Class ERTi-7 is a welding wire commonly used in TIG and MIG welding techniques. This blog post provides an in-depth overview of AWS Class ERTi-7 MIG & TIG, its composition, physical and mechanical properties, uses, heat treatment, and corrosion resistance to help you understand its potential for your welding projects.
What is AWS Class ERTi-7 MIG & TIG?
AWS Class ERTi-7 MIG & TIG welding electrodes are high-alloy, chromium-nickel stainless steel electrodes with superior corrosion and oxidation resistance. They are designed to provide excellent weldability with minimal porosity at elevated temperatures (up to 700°C). ERTi-7 MIG & TIG welding offers exceptional tensile strength, long service life, and low moisture absorption. It is commonly used in applications requiring an extreme level of sanitation, like food processing or medical environments. Furthermore, it can join cast iron, dissimilar steel alloys such as austenitic and ferritic steel grades and stainless steel components to other metals or alloyed materials.
ERTi-7 MIG & TIG Welding Wire Composition
AWS Class ERTi-7 is a grade 2 titanium welding wire with 99.0% pure titanium. It also contains 0.12% to 0.25% palladium, improving weldability and preventing welding zone oxidation. Iron, nickel, and oxygen are other elements in the wire which help strengthen the weld and increase the material’s tensile strength and corrosion resistance.
| AWS A5.16 | N | C | H | Fe | O | Al | V | Pd | Mo | Ni |
Ti |
| ERTi-7 | 0.015 | 0.03 | 0.008 | 0.12 | 0.08–0.16 | / | / | 0.12-0.25 | / | / |
Bal |
ERTi-7 MIG & TIG Welding Wire Physical Properties
AWS Class ERTi-7 MIG & TIG welding alloy exhibits excellent thermal conductivity, low thermal expansion, and high melting point. The wire comes in a diameter range of 0.02 to 0.125 inches, with spools and coils packaging available depending on specific welding projects. However, AWS Class ERTi-7 MIG & TIG is prone to cold cracking like most titanium alloys due to its higher thermal stresses than other metals.
ERTi-7 MIG & TIG Welding Wire Mechanical Properties
AWS Class ERTi-7 MIG & TIG filler wire provides a high strength-to-weight ratio and corrosion resistance. It has excellent resistance to wear, high temperatures, and seawater, making it an ideal choice for welding marine and aerospace components such as aircraft fuselage, engine components, heat exchangers, and ship propellers. The wire also provides excellent elongation properties, which means it can withstand deformation and fatigue without breaking or cracking under stress.
| Heat T rea tment | RP 0 ,2 (N/mm 2 ) |
Rm ( N/mm 2 ) |
A5 (%) |
Impa ct Energy (J) ISO-V |
Hardness | ||
| -20°C | -40°C | -60 °C | HRc / HV | ||||
|
as welded |
250 | 320 | — | – – | – – | — | — |
AWS Class ERTi-7 MIG & TIG Welding Wire Trade Names
| Class | UNS | Oxford Alloys | BOHLER |
| ERTi-7 | R54520 | Alloy Ti-7 | BOHLER ERTi-7 -IG |
ERTi-7 MIG & TIG Welding Wire Parameters
| AWS Clas sif ic at ion |
T ens ile St re ngt h(m in) |
Y eild St rengt h(m in) |
Elongation( % ) |
||
|
ks i |
M Pa |
ks i |
MP a |
||
| ER Ti-7 |
5 0 |
3 45 |
4 0 |
27 5 |
18 |
ERTi-7 MIG & TIG Welding Wire Uses
AWS Class ERTi-7 MIG & TIG wire is widely used in the medical, marine, aerospace, and chemical processing industries where high-quality and corrosion-resistant welds are necessary. It is particularly useful for repairing or joining titanium components and alloys commonly used in these industries. The wire can also weld dissimilar metals like stainless steel and nickel alloys.
ERTi-7 MIG & TIG Welding Wire Heat Treatment
AWS Class ERTi-7 MIG & TIG electrode does not require post-weld heat treatment since it is resistant to hard work and strain hardening. However, proper heat input and cooling rate should be observed to minimize the risk of cold cracking. A preheat treatment may be necessary when welding thick plates to prevent the formation of cracks during welding.
ERTi-7 MIG & TIG Welding Wire Corrosion Resistance
AWS Class ERTi-7 MIG & TIG filler metal exhibits excellent corrosion resistance in saltwater and oxidizing environments. It is immune to stress corrosion cracking and pitting, making it an ideal choice for marine applications, chemical processing, and hot brine circulation. However, when used with dissimilar metals with incompatible electrochemical potentials, the wire may be prone to galvanic corrosion.
Conclusion
In conclusion, AWS Class ERTi-7 MIG & TIG welding wire is a high-quality, versatile welding wire with excellent mechanical properties, corrosion resistance, and a high strength-to-weight ratio. Its composition, physical and mechanical properties, uses, heat treatment and corrosion resistance make it a crucial resource for many industries, including aerospace, medical, marine, and chemical processing. With proper handling and use, the wire can produce quality welds that meet industry standards and your welding project requirements.
Meet Heer, a dynamic and driven writer learning tricks of her trade in the metal industry. With a background in Digital Marketing, Heer brings a unique perspective to her writing, sharing valuable insights. Apart from blogging she like reading and hiking.
