Certification
Difference between AWS CWI & CSWIP?
AWS CWI is the US standard (AWS D1.1), while CSWIP is the UK/International standard (TWI) used in Oil & Gas.
Read Comparison →
Calculation
How to calculate Heat Input?
Formula: (Volts × Amps × 60) / Travel Speed. It controls cooling rates and HAZ properties.
View Formula →
Drawing
How to read Welding Symbols?
Symbols have a reference line and arrow. Symbols below the line mean "Arrow Side", above mean "Other Side".
View Chart →
Electrodes
What does E7018 mean?
E=Electrode, 70=70ksi Tensile Strength, 1=All Positions, 8=Low Hydrogen Coating (AC/DCEP).
Full Guide →
Electrodes
E6010 Rod Uses?
E6010 is a cellulosic electrode used for deep penetration (roots) on DC+ polarity in pipelines.
E6010 Guide →
Defects
What causes Porosity in welds?
Trapped gas caused by moisture on electrodes, lack of shielding gas, or dirt/oil on the base metal.
Fix Porosity →
Process
Why do we Preheat steel?
To slow cooling rates and allow hydrogen to escape, preventing Hydrogen Induced Cracking (Cold Cracking).
Preheat Guide →
Practical
Can you weld Rebar?
Yes, if it is "Weldable Grade" (marked with a 'W'). Low carbon rebar requires specific preheat and low-hydrogen electrodes.
Rebar Guide →
Repair
Best rod for Cast Iron?
Nickel-based rods like ENi-CI (Nickel 99) or ENiFe-CI (Nickel 55) are best to prevent cracking.
Cast Iron Guide →
Materials
SS 316 Welding?
316 contains Molybdenum for corrosion resistance. It requires E316L filler wire to prevent carbide precipitation.
316 Guide →
Defects
What is Undercut?
A groove melted into the base metal at the weld toe, usually caused by high amps or incorrect travel speed.
Prevent Undercut →
Metallurgy
What is Carbon Equivalent (CE)?
A number calculating weldability. High CE (>0.40) means higher risk of cracking and need for preheat.
Understand CE →
Inspection
What are the main NDT methods?
Visual (VT), Dye Penetrant (PT), Magnetic Particle (MT), Ultrasonic (UT), and Radiography (RT).
NDT Guide →
Skills
What is the 6G Welding Position?
Pipe fixed at a 45° angle. It is the hardest test because it covers all positions (flat, vertical, overhead).
6G Tips →
Docs
What is an MTC?
Material Test Certificate. It certifies the chemical and mechanical properties of the steel/consumable.
Read MTC →
Advanced
How to weld Duplex Stainless?
Requires careful heat input control to maintain the Austenite/Ferrite balance. Use 2209 fillers for 2205.
Duplex Guide →
Defects
Types of Weld Cracks?
Hot Cracking (Solidification) happens during cooling. Cold Cracking (Hydrogen) happens hours/days later.
Crack Prevention →
Process
How to TIG Weld Aluminum?
Use AC polarity to clean the oxide layer. Use pure tungsten (Green) or Zirconiated (White) for older machines.
Alu TIG Guide →
Defects
Lack of Fusion vs Penetration?
Fusion is failure to bond with side walls. Penetration is failure to reach the root of the joint.
Read More →
Testing
What is Charpy Impact Testing?
A destructive test measuring a metal's toughness (energy absorption) at specific temperatures.
Test Guide →
Design
How to measure Fillet Weld?
Measured by Leg Length (side of triangle) or Throat Thickness (center to face). Throat = 0.707 × Leg.
Measure Welds →
Materials
Welding Corten (Weathering) Steel?
Use color-matching fillers (like E8018-W2) if the weld will be exposed. Standard E7018 works for non-exposed.
Corten Guide →
Advanced
Challenges of P91 Steel?
Requires strict Preheat, Interpass temp control, and immediate Post Weld Heat Treatment (PWHT).
P91 Guide →
Testing
Why test Weld Hardness?
High hardness in the HAZ indicates brittle microstructure susceptible to cracking. Limits are often 248 HV10.
Hardness Guide →
CertificationDifference between AWS CWI & CSWIP?
AWS CWI is the US standard (AWS D1.1), while CSWIP is the UK/International standard (TWI) used in Oil & Gas.
Read Comparison →
CalculationHow to calculate Heat Input?
Formula: (Volts × Amps × 60) / Travel Speed. It controls cooling rates and HAZ properties.
View Formula →
DrawingHow to read Welding Symbols?
Symbols have a reference line and arrow. Symbols below the line mean "Arrow Side", above mean "Other Side".
View Chart →
ElectrodesWhat does E7018 mean?
E=Electrode, 70=70ksi Tensile Strength, 1=All Positions, 8=Low Hydrogen Coating (AC/DCEP).
Full Guide →
ElectrodesE6010 Rod Uses?
E6010 is a cellulosic electrode used for deep penetration (roots) on DC+ polarity in pipelines.
E6010 Guide →
DefectsWhat causes Porosity in welds?
Trapped gas caused by moisture on electrodes, lack of shielding gas, or dirt/oil on the base metal.
Fix Porosity →
ProcessWhy do we Preheat steel?
To slow cooling rates and allow hydrogen to escape, preventing Hydrogen Induced Cracking (Cold Cracking).
Preheat Guide →
PracticalCan you weld Rebar?
Yes, if it is "Weldable Grade" (marked with a 'W'). Low carbon rebar requires specific preheat and low-hydrogen electrodes.
Rebar Guide →
RepairBest rod for Cast Iron?
Nickel-based rods like ENi-CI (Nickel 99) or ENiFe-CI (Nickel 55) are best to prevent cracking.
Cast Iron Guide →
MaterialsSS 316 Welding?
316 contains Molybdenum for corrosion resistance. It requires E316L filler wire to prevent carbide precipitation.
316 Guide →
DefectsWhat is Undercut?
A groove melted into the base metal at the weld toe, usually caused by high amps or incorrect travel speed.
Prevent Undercut →
MetallurgyWhat is Carbon Equivalent (CE)?
A number calculating weldability. High CE (>0.40) means higher risk of cracking and need for preheat.
Understand CE →
InspectionWhat are the main NDT methods?
Visual (VT), Dye Penetrant (PT), Magnetic Particle (MT), Ultrasonic (UT), and Radiography (RT).
NDT Guide →
SkillsWhat is the 6G Welding Position?
Pipe fixed at a 45° angle. It is the hardest test because it covers all positions (flat, vertical, overhead).
6G Tips →
DocsWhat is an MTC?
Material Test Certificate. It certifies the chemical and mechanical properties of the steel/consumable.
Read MTC →
AdvancedHow to weld Duplex Stainless?
Requires careful heat input control to maintain the Austenite/Ferrite balance. Use 2209 fillers for 2205.
Duplex Guide →
DefectsTypes of Weld Cracks?
Hot Cracking (Solidification) happens during cooling. Cold Cracking (Hydrogen) happens hours/days later.
Crack Prevention →
ProcessHow to TIG Weld Aluminum?
Use AC polarity to clean the oxide layer. Use pure tungsten (Green) or Zirconiated (White) for older machines.
Alu TIG Guide →
DefectsLack of Fusion vs Penetration?
Fusion is failure to bond with side walls. Penetration is failure to reach the root of the joint.
Read More →
TestingWhat is Charpy Impact Testing?
A destructive test measuring a metal's toughness (energy absorption) at specific temperatures.
Test Guide →
DesignHow to measure Fillet Weld?
Measured by Leg Length (side of triangle) or Throat Thickness (center to face). Throat = 0.707 × Leg.
Measure Welds →
MaterialsWelding Corten (Weathering) Steel?
Use color-matching fillers (like E8018-W2) if the weld will be exposed. Standard E7018 works for non-exposed.
Corten Guide →
AdvancedChallenges of P91 Steel?
Requires strict Preheat, Interpass temp control, and immediate Post Weld Heat Treatment (PWHT).
P91 Guide →
TestingWhy test Weld Hardness?
High hardness in the HAZ indicates brittle microstructure susceptible to cracking. Limits are often 248 HV10.
Hardness Guide →
