problem s355mc

[MechProj]

Good morning, everyone. I'm doing training and welding tests with a material I've never used. This is the s355mc. There were no problems in forming. in weld tig instead there were difficulties in bringing to merge the material with the electrode (tungsteno + gas argon) that warmed up a lot and the bath to present bubbles. I am amazed that this material should be little more than a structural classic with good weldability. in a few days I will try wire welding as the material in question will be welded in both ways. Does anyone have experience with this? Thank you in advance

 

[PIETRO2002]

forming bubbles during s355mc steel welding can be caused by several factors. here are some possible causes of bubbles during welding:

1. moisture or contamination: presence of moisture, or contaminants such as oil, grease, paint or rust on the surface of the steel, can cause the formation of bubbles during welding. These materials can vaporize or release gas when heated, creating bubbles.
2. inadequate protection gas: if the protective gas used in mig/mag or tig (tungsten inert gas) is incorrect or insufficient, atmospheric contamination of the melting bath may occur. this can lead to the formation of bubbles in welding.
3. Improper welding parameters: the use of inappropriate welding parameters, such as too high current and voltage, can cause excessive steel heating and gas and bubble formation during the welding process.
4. inadequate preparation of surfaces: insufficient cleaning of the surfaces to be soldered can cause the detainment of contaminants that can vaporize during welding, creating bubbles.
5. chemical composition of steel: some unwanted impurities or inclusions in the composition of steel can contribute to the formation of bubbles during welding. Such impurities can react with heat and form gas.

 

[PIETRO2002]

to avoid forming bubbles during welding, it is advisable to take the following precautions:

• ensure that weld surfaces are clean and contaminant-free.
• use adequate protection gases during mig/mag or tig welding.
• correctly verify and adjust the welding parameters.
• use suitable and high quality intake materials.
• follow the specifications and recommendations of the steel manufacturer and relevant welding regulations.

 

[MechProj]

to avoid forming bubbles during welding, it is advisable to take the following precautions:

• ensure that weld surfaces are clean and contaminant-free.
• use adequate protection gases during mig/mag or tig welding.
• correctly verify and adjust the welding parameters.
• use suitable and high quality intake materials.
• follow the specifications and recommendations of the steel manufacturer and relevant welding regulations.

thanks for the answer, tomorrow I will check better protection gas and parameters. I thought it might be a material problem. being present vanadium, titanium and niobium, I suspect that these bind to c form carbides that make it difficult to merge with tig (without material supply)

 

[PIETRO2002]

you can be included in the material, maybe a different casting is well welded.