• Welding – Process of joining similar metals (or thermoplastic).
    • By heating them to suitable temperature
    • May or may not require pressure
    • May or may not require Filler metal
  • Brazing -Process of joining dis-similar metals.
    • By Melting and pouring the filler metal and pouring on to the joint
    • Both the metals are pre-heated to a suitable temperature
    • Filler metal fills the joint gap by capillary action.

Welding Equipment

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Different Welding Processes

  • SMAW –Shielded Metal Arc Welding
  • TIG / GTAW – Tungsten Inert Gas
  • GMAW /MIG – Gas Metal Arc Welding
  • FCAW – Flux Cored Arc Welding
  • SAW – Submerged Metal Arc Welding
  • ERW – Electric Resistance Welding
  • FSW – Friction Stir Welding
  • Electron Beam Welding

And Lot more …….

Welding Codes & Standards

  • ASME section IX – Welding & Brazing qualification
  • ASME B31.1 – Power Piping
  • ASME B 31.3 – Process Piping
  • ASME Section VIII – Pressure Vessel
  • AWS D 1.1 – Structural Steel Welding
  • AWS B 2.1 – Specification for welding procedure & Performance qualification
  • API RP 577 – Welding Inspection & Metallurgy
  • API 1104 – Welding of Pipelines & related facilities


Process of WPS Preparation

  • Select the thickness & dia. of the test plate/pipe to be welded.
  • Prepare the plate/pipe to the required dimension & bevel configuration.
  • Fit up in the required position.
  • Ask the welder to perform the weld and prepare a Run sheet.
  • Note down the Current, Voltage, Gas flow rate, travel speed of the welder for unit length & surface temprature. Calculate the Heat Input Values of each weld Pass

Test Weld Positions

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Welder Qualification

  • Welder should perform the test weld on the similar coupon following all the variables given the approved WPS.
  • Example (position, approved filler metal, approved base metal, allowed Electrical characteristics, allowed Gas flow rate, Pre heat & post weld heating requirements.
  • Perform Visual and NDT tests, Macro tests on the weld coupon and qualify the welder.
  • Welder qualification certificate should be renewed 6 months once, as per code requirement.

Welder training    

For Welder Training, Welder qualification certificate & Welder Certification, Preparation of WPS /PQR, Approval of WPS & PQR, Welding Inspection trainings and Non Destructive Testing Services and Trainings reach us at https://aqcinspection.com/

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