I recommend multi-pass GTAW process.
Ayyappan, see this link:
http://www.keytometals.com/Articles/Art99.htm
because of micro structure of maraging steel , you can use friction welding. in this case . no observed micro structure changing due to the minimum HAZ,( heat effected zone). In otherwise, u should get another methods such as MIG.
GTAW is the best welding process for maraging steel. other processes like ebw. lbw can also be used.
It would really help to know the joint configuration and material thickness. In general, GTA or GMA are excellent processes for maraging steels. EBW (assuming the part will fit an available vacuum chamber) or LBW are also good choices. The traditional friction processes are rather limited in joint area capable of being bonded. FSW of maraging steels is not a very mature process.
Not sure about your shrinkage comment. Do you mean you get shrinkage across the joint or do you get shrinkage porosity?
GTAW is the most commonly used welding technique. Laser welding and FSW are also preferred when sample thickness is less than 5 mm. If the thickness is more than 10 mm, the best method is Laser hybrid welding.
Dear Ayyappan Gowthaman,
Maraging steels are iron-nickel alloys that are designed with a combination of good fracture toughness and high strength. This means high-strength steel with increased toughness. Maraging steels are a class of ultra high strength steel that undergoes diffusion-less martensitic transformation on quenching & develops high strength on subsequent aging through precipitation of fine inter-metallic compounds. The age-hardening of low carbon martensite results in the achievement of the properties. Maraging steel is used extensively for welding die cast dies. Maraging also refers to the aging of martensite, a hard microstructure commonly found in steels. It mainly is a strengthening mechanism transforming the alloy to martensite with subsequent age hardening. It also works well with electromechanical components which require ultra-high strength. These steels are carbon-free nickel-rich alloys with superior strength and toughness. The maraging steel is mainly used in aerospace and tooling application.Their usage has a wide spectrum of application from fabrication of rocket motor casing in launch vehicles & missiles for the Aerospace Industries, but also to submarine hulls & automobile industries etc.
Welding of Maraging steel
The gas tungsten-arc produces the best weld toughness in maraging steels. Lower values are seen in welds made with the gas metal-arc, electron beam, and flux- shielded processes. The welding of maraging steel takes place at room temperature and the die cast insert is kept cool by overlaying the weld by successive small amounts instead of all at once. This avoids the introduction of heat to the die-cast quantities sufficient to age-harden the maraging steel, or to affect the parent insert material.
Refer paper which may be useful for you.
Paper for references:
1.https://www.researchgate.net/publication/303895038_Welding_of_Maraging_Steel_their_properties
2. https://www.researchgate.net/publication/265015690_Studies_on_Welding_of_Maraging_Steels
3. Madhusudhan Reddy, G., Venkata Ramana, P., 2012. Role of nickel as an interlayer in dissimilar metal friction welding of Maraging steel to low alloy steel, Journal of Materials Processing Technology 212, p. 66– 77.
4. Shamantha, C.R., Narayanan. R., Iyer, K.J.L., Radhakrishnan, V.M., Seshadri, S.K., Sundararajan, S., Sundaresan, S., 2000. Microstructural changes during welding and subsequent heat treatment of 18Ni (250-grade) Maraging steel, Materials Science and Engineering A287, p.43–51.
4 no. papers have description of microstructure of maraging steel with welding and subsequent heat treatment. Please go ahead.
Ashish
hello,
what is the composition of the etchant of a weld sample of copper (brass+zinc) on stainless steel (316L Si)?
if you could guide me to where i can find data of an etchant that matches both material would also be great
thank you in advance
Ashish Thakur Ayyappan Gowthaman Bibin Jose Robert A Hafley