How to make a Good Weld? (Remember these 4 things)

How to make a Good Weld

Being a welder you might have a question “How to make a good weld?”. Isn’t it?

Don’t worry. Here I have mentioned 4 things that you should remember to get a good weld.

To get a good weld, remember these 4 main things…

  1. Always have a good source of energy.
  2. You should remove the surface contaminants.
  3. Always protect the metal from atmospheric contamination.
  4. You should control the weld metallurgy (or weld properties)

Let me explain these points in short.

#1) Always have a good source of energy

  • There are various types of welding processes used for metal joining operations.
  • All these welding processes use the energy which is supplied in the form of heat.
  • Depending upon the type of welding process, these heat supply can be in the form of flame, arc, electric current, or by mechanical means (like friction, explosion or ultrasonic vibrations).
  • In very few welding process like fusion welding, the pressure is used to force the weld region to the plastic condition and then the metals are joined and fused together.
  • Thus for all these welding processes, a source of energy is required.
  • This source of energy should be good and as per requirements of the process.
  • If there will be any issues in the source of energy, then ultimately the quality of welds will be affected.

#2) You should remove the surface contaminants

  • In welding process, the surface contaminants include organic films, adsorbed gases, and chemical compounds of the base metal.
  • When heat is used as an energy source for welding purposes, it removes the organic films and adsorbed gases.
  • But the oxides films remains to be cleaned.
  • The welding fluxes are used to clean the oxide films and other contaminants which are responsible to form a slag that floats and solidifies above the weld bead which ultimately protects the weld from further oxidation.

#3) Always protect the metal from atmospheric contamination

  • In order to protect the weld pool and filler material from atmospheric contamination (specifically oxygen and nitrogen gas), some shielding gases are used.
  • These shielding gases include helium gas, argon gas, or carbon dioxide gas.

#4) You should control the weld metallurgy (or weld properties)

  • During the solidification of the weld, the microstructures are formed in the weld.
  • The region which is affected by the heat will experience a much change in mechanical properties.
  • Also for controlling the cooling rates of the weld, preheating and post welding heat treatment are used.
  • Also during the manufacturing of the base metals, some alloying materials are added during the foundry process to control the properties of the weld metal.

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