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Quizzes > Business & Finance > Business & Industry

Master Your LA City Welder Certification Test Now

Take the LA City welding license practice test to become a certified welder

Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art welding helmet torch sparks certificate stopwatch on sky blue background timed closed-book LA City welding quiz

Ready to prove your expertise? Take our free LA City welder certification test and sharpen the critical skills required to earn your LA City welding license . This timed, closed-book quiz dives deep into essential techniques - from bead profiles to joint inspections - so you'll gain confidence before sitting the official la city welding certification exam. Whether you're aiming to become an LA City certified welder or want an extra boost with a certified welding inspector practice test, our friendly challenges and instant feedback will guide you every step of the way. Sign up, start now, and elevate your welding career!

What does the shade number on a welding helmet lens indicate?
The helmet weight rating
The amount of visible light and radiation it blocks
The lens' viewing angle
The helmet material type
The shade number on a welding helmet lens corresponds to its ability to filter out harmful light and radiation, protecting the welder's eyes. Higher shade numbers block more light, suitable for higher-amp welding processes. Selecting the correct shade prevents eye strain and flash burns. OSHA Welding Safety
What is the primary purpose of preheating base metal before welding?
To reduce the risk of cracking in the heat-affected zone
To increase the hardness of the weld deposit
To remove surface scale and rust
To test the welding torch setup
Preheating base metal raises its temperature to slow cooling, reducing thermal stresses that can cause cracking in the heat-affected zone. It also helps hydrogen escape, minimizing hydrogen-induced cracking. Preheating is especially important for thicker sections and high-alloy steels. AWS Preheat Guidelines
Which gas mixture is most commonly used for MIG welding mild steel?
100% CO?
75% argon, 25% CO?
100% argon
95% argon, 5% oxygen
A mix of 95% argon and 5% oxygen provides good arc stability and wetting for MIG welding mild steel. Oxygen improves fusion and bead shape without excessive spatter. Pure CO? can be used but leads to more spatter and a rougher bead. Lincoln Electric Gas Guide
In SMAW, what does the electrode classification E6010 signify?
60,000 psi tensile strength, 10% elongation, cellulose sodium coating
70,000 psi tensile strength, 10% elongation, rutile coating
60,000 psi tensile strength, 1% elongation, iron powder coating
60,000 psi tensile strength, 10% elongation, cellulose potassium coating
The E6010 electrode offers a tensile strength of 60,000 psi, a minimum of 10% elongation, and features a cellulose potassium coating that promotes deep penetration. It's widely used for pipeline and root-pass welding due to its fast-freeze puddle. The potassium-type coating gives a smooth arc and cleans the weld zone. AWS Electrode Facts
What grounding requirement is essential for safe welding operations?
Use a ground rod driven into the soil
Attach ground clamp directly to the workpiece or work table
Clamp ground to the nearest available metal object
Ensure the ground clamp is as far away from the weld area as possible
Proper grounding requires clamping the ground cable directly to the workpiece or work table to complete the circuit efficiently, minimizing resistance and preventing stray currents. This reduces the risk of arc wandering and electrical hazards. Ground rods are used for electrical systems, not for portable welding machines. OSHA Welding Grounding
Which weld symbol indicates a fillet weld?
A cross sign at the junction of lines
A semicircle on the reference line
A straight line parallel to the arrow
A right-angle triangle on the reference line
A fillet weld symbol is represented by a right-angle triangular shape on the reference line pointing to the joint. It indicates weld metal added to the joint's inside corner. Semicircles indicate groove welds, and straight lines without the triangle indicate plug or slot welds. AWS A2.4 Weld Symbols
What is weld slag and why must it be removed?
Flux residue that can hinder proper fusion and inspection
Flux residue that can cause porosity if not cleaned
Oxidation layer that improves weld strength
Excess metal build-up for reinforcement
Slag is the solidified flux residue from SMAW or FCAW processes. If not removed between passes, slag can be trapped in subsequent layers, causing inclusions and weakening the weld. It also hinders visual and nondestructive inspection. Proper chipping and brushing ensure weld integrity. Lincoln Electric SMAW Guide
Why is preheating particularly important when welding thick carbon steel plate?
It cools the plate rapidly after welding
It eliminates the need for post-weld heat treatment
It reduces residual stresses and cracking risk
It increases carbon content in the weld
Thick carbon steel has a higher tendency to develop residual stresses that can lead to cracking. Preheating slows the cooling rate, allowing hydrogen to diffuse out and reducing the risk of cold cracking in the heat-affected zone. It also helps achieve uniform weld penetration. Metals Journal on Preheat
What unit is typically used to specify the tensile strength of a welding electrode?
Joules (J)
Pounds per square inch (psi)
Coulombs (C)
Millimeters (mm)
Tensile strength of welding electrodes is expressed in pounds per square inch (psi), indicating the stress the weld deposit can withstand before failure. Metric conversions may use megapascals (MPa). Other units like joules measure energy, and millimeters specify dimensions. AWS Electrode Classifications
Which welding code is most commonly referenced for structural steel in LA City building projects?
MIL-STD-2219
AWS D1.1
ASME Section IX
API 1104
AWS D1.1 is the Standard for Structural Welding of Steel, widely adopted by municipalities including LA City. It covers qualification of welders, procedures, and acceptance criteria. ASME Section IX addresses pressure vessel welding, while API 1104 is for pipelines. AWS D1.1 Overview
What is the purpose of back gouging in groove welds?
To test the fit-up before final welding
To enlarge the root opening
To add decorative fillet features
To remove root reinforcement and ensure full penetration
Back gouging removes weld metal and base metal on the backside of a groove weld, eliminating root reinforcement and ensuring complete fusion through the thickness. It is essential for critical joints where full penetration is required. Proper gouging prevents lack of fusion defects. AWS Procedure Qualification
In TIG welding, what is the role of the torch collet?
To hold the tungsten electrode securely
To regulate shielding gas flow
To measure current output
To direct filler rod into the arc
The collet in a TIG welding torch grips the tungsten electrode, maintaining axial alignment and preventing electrode slippage. A proper collet ensures consistent arc stability and heat input. It also helps dissipate heat away from the tungsten. Lincoln Electric TIG Collets
Which practice helps minimize porosity in gas-shielded welds?
Cleaning the base metal to remove contaminants
Using lower welding current
Increasing travel speed excessively
Welding in high-humidity conditions
Contaminants like oil, rust, and moisture produce gases that cause porosity when trapped in the weld. Thorough cleaning of the base metal with wire brushes or solvents is critical. Proper gas flow and technique also help, but cleanliness is the first control. AWS Shielding Gases Guide
How is preheat temperature typically measured on steel before welding?
Comparing to weld electrode temperature
Using a thermocouple or temperature-indicating crayons
Estimating by torch color
By feeling the surface with a hand
Accurate preheat measurement uses thermocouples or temperature-indicating crayons/pencils that melt at specific temperatures. This ensures the base metal is at the correct preheat before welding. Guessing by feel or torch color is unreliable and can lead to cracking. AWS Preheat Methods
What is the main purpose of post-weld heat treatment (PWHT)?
To clean the weld surface
To relieve residual stresses and improve toughness
To deposit additional filler metal
To increase weld bead hardness
PWHT reduces residual stresses from welding, softens hard microstructures, and improves toughness in the heat-affected zone. It is critical for thick sections and alloy steels prone to hydrogen-induced cracking. Controlled heating and cooling cycles achieve the desired material properties. ASME PWHT Guidelines
Which notation describes a welding position where the plate is vertical and the weld is made horizontally?
1G
2F
4F
3G
The 2F (two-fillet) position refers to a horizontal fillet weld on a vertical surface. In contrast, 3G is a vertical groove, 1G is flat, and 4F is overhead fillet. Position notations help ensure welders meet qualification standards. AWS Welding Positions
How do you calculate welding heat input?
Travel Speed / (Voltage × Current)
Voltage + Current - Travel Speed
Voltage × Travel Speed / Current
Voltage × Current / Travel Speed × 60
Heat input (kJ/in) is calculated by (Voltage × Current) ÷ Travel Speed (in/min) × 60. This quantifies the energy applied per unit length of weld, affecting microstructure and cracking risk. Accurate measurement of all parameters is essential for process control. AWS Heat Input Calculation
What is the benefit of using pulsed MIG welding?
Improved control of heat input and reduced spatter
Automatic slag removal
Faster travel speeds only
Lower equipment cost
Pulsed MIG alternates between high and low current, controlling heat input and reducing distortion. It delivers metal in controlled droplets, minimizing spatter and improving weld appearance. This makes pulsed MIG ideal for thin materials and out-of-position welding. Lincoln Electric Pulsed MIG Guide
What welding defect is characterized by a groove melted into the parent metal along the weld toe?
Underbead cracking
Overlap
Porosity
Undercut
Undercut is a groove or depression at the weld toe caused by excessive current or improper technique, reducing cross-sectional thickness. It acts as a stress concentrator and can lead to fatigue failure. Proper parameters and travel speed prevent undercut. AWS Weld Defects Guide
How does lack of fusion differ from porosity in a welded joint?
Lack of fusion is an incomplete bond between weld and base metal; porosity is trapped gas pockets
They are the same defect under different names
Lack of fusion is multiple cracks; porosity is slag inclusions
Lack of fusion occurs only in TIG; porosity only in SMAW
Lack of fusion is a discontinuity where the weld metal fails to fuse with the base or preceding weld bead. Porosity consists of gas pockets trapped within the weld. Each defect has distinct causes and inspection methods. Both compromise weld integrity but require different corrective actions. AWS Weld Discontinuities
Which filler metal is recommended for brazing high-strength alloy steel?
AWS BCuP-5
AWS ER70S-6
AWS MBF-15
AWS E308L-16
AWS MBF-15 is a brass filler metal suitable for brazing high-strength alloy steels, offering good flow and joint strength. BCuP-5 is typically used for mild steel, while ER70S-6 and E308L-16 are welding electrodes, not brazing fillers. Correct filler selection ensures joint reliability. AWS Brazing Alloy Guide
What acceptance criteria are used for an API 5L bend test on a welded pipe sample?
Weld reinforcement less than 1/8 inch
Complete penetration depth greater than wall thickness
Bead width matching root opening
No cracks visible to the naked eye after bending to specified angle
API 5L requires bend test samples to be bent at a specified angle without showing cracks visible to the naked eye. This demonstrates ductility and absence of defects. Other metrics like reinforcement and penetration are evaluated in separate tests. API 5L Standards
What travel angle is generally recommended for flat MIG welding beads?
20 - 25 degrees push angle
5 - 10 degrees pull angle
0 - 5 degrees push angle
45 degrees perpendicular
A 5 - 10° pull (drag) angle is commonly used in flat MIG welding to improve penetration and ensure adequate weld pool control. A slight drag helps direct the arc into the joint and reduce spatter. Push angles are used for out-of-position welding. Lincoln Electric MIG Techniques
What method is most effective for preventing hydrogen-induced cracking in high-strength steels?
Applying rapid cooling after welding
Increasing travel speed dramatically
Using high-hydrogen electrodes
Preheating and controlling interpass temperature
Hydrogen-induced cracking in high-strength steels is prevented by preheating and maintaining interpass temperatures, allowing hydrogen to diffuse out before cool-down. Low-hydrogen electrodes and proper storage also help but temperature control is key. Rapid cooling traps hydrogen and increases cracking risk. AWS Hydrogen Cracking Guide
Why is a root opening and land specified in groove weld designs?
To ensure proper root penetration and fit-up consistency
To reduce welding time by enlarging the gap
To increase heat input at the joint
To control weld reinforcement thickness
A specified root opening and land ensure consistent fit-up and adequate root penetration during welding. The root land supports the molten metal, preventing burn-through. Proper dimensions lead to uniform joint strength and reduce defects. AWS Groove Weld Design
What inspection technique is most suitable for detecting subsurface weld cracks?
Magnetic particle testing
Liquid penetrant testing
Chipping and wire brushing
Visual inspection
Magnetic particle testing (MT) detects surface and near-surface discontinuities in ferromagnetic materials by using a magnetic field and iron particles. Cracks distort the field, attracting particles to form visible indications. Liquid penetrant only finds surface defects, and visual inspection is limited. AWS NDT Methods
What does the carbon equivalent (CE) value indicate in weldability assessments?
The proportion of carbon in the filler metal
The amount of shielding gas required
The combined effect of alloying elements on hardenability
The equivalent hardness of the welded joint
Carbon equivalent (CE) quantifies the combined effect of carbon and other alloying elements on steel's hardenability. A higher CE indicates increased risk of hardening and cracking, guiding preheat and welding procedure selection. It's calculated using recognized formulas like IIW or CES. Metals Journal on CE
When might an E7018 electrode be preferred over an E6011 in SMAW?
When high spatter levels are acceptable
For root passes requiring deep penetration
When welding heavily rusted surfaces
For medium-to-high strength steels requiring smooth arcs and low hydrogen
E7018 is a low-hydrogen, iron powder electrode ideal for medium-to-high strength steels, offering a smooth arc and minimal spatter. It's chosen for structural applications where toughness and crack resistance matter. E6011, with high cellulose coating, is better for dirty or rusted surfaces. AWS E7018 Fact Sheet
What is the significance of controlling interpass temperature?
It reduces the need for shielding gas
It improves electrode bonding only
It prevents excessive grain growth and cracking
It increases deposition rate automatically
Interpass temperature control ensures subsequent weld beads are deposited at a stable temperature, preventing excessive heat accumulation that leads to coarse grains and reduced toughness. It also maintains hydrogen diffusion and reduces residual stress. Proper control is critical for thick sections and alloy steels. AWS Interpass Temperature
How is the cooling rate in the heat-affected zone (HAZ) calculated for a carbon steel weld?
With magnetic particle testing readings
By measuring weld bead width and multiplying by thickness
By counting weld passes
Using time - temperature transformation (TTT) curves and thermal diffusivity data
The cooling rate in the HAZ is derived from TTT curves, which relate temperature to transformation times, combined with thermal diffusivity of the steel. Accurate weld thermal cycles are recorded using thermocouples. This calculation predicts microstructure and hardness changes. TWI Thermal Cycling
When welding 304 stainless steel, why must heat input be carefully controlled to avoid sensitization?
Low heat input leads to delta ferrite formation
High heat input dissolves chromium carbides excessively
Heat input above critical range causes chromium carbide precipitation at grain boundaries
High heat input induces martensitic transformation
Sensitization of 304 stainless occurs when chromium carbides precipitate at grain boundaries if heat input places the HAZ between 450 - 850°C. This depletes chromium and reduces corrosion resistance. Controlling heat input and using stabilized grades prevents sensitization. ASM Stainless Sensitization
According to LA City building code, at what maximum carbon equivalent does preheat become mandatory for structural welding on carbon steel over 3/4 inch thick?
CE > 0.35
CE > 0.50
CE > 0.40
CE > 0.25
LA City code adopts AWS D1.1 criteria requiring preheat for carbon steel materials over 3/4" thick when carbon equivalent exceeds 0.40 to prevent hydrogen cracking. This threshold balances weldability with thermal stress control. Always verify the latest code edition for amendments. LA City Building Code
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Study Outcomes

  1. Understand Welding Fundamentals -

    Define core welding processes, metallurgy concepts, and terminology essential for the LA City welder certification test.

  2. Identify Safety Standards -

    Recognize OSHA regulations and LA City welding certification safety protocols to ensure a compliant work environment.

  3. Apply Welding Techniques -

    Execute proper electrode selection, joint preparation, and bead placement techniques aligned with LA City welding license requirements.

  4. Analyze Exam-Style Questions -

    Interpret closed-book prompts and choose accurate answers to mirror the format of the LA City welding certification exam.

  5. Evaluate Personal Proficiency -

    Review quiz results to identify strengths and knowledge gaps ahead of the welder certification test or certified welding inspector practice test.

  6. Develop Time Management Strategies -

    Implement pacing techniques and time allocation methods to complete the welder certification test within the allotted timeframe.

Cheat Sheet

  1. Master Core Welding Processes -

    Familiarize yourself with SMAW, GMAW and FCAW differences in heat input, electrode type and shielding gas as outlined by the American Welding Society. Use the mnemonic "Silly Gophers Find" to recall SMAW, GMAW, FCAW in sequence. Mastery of each process boosts your confidence for any welder certification test question.

  2. Control Electrical Parameters Accurately -

    Practice calculating heat input with the formula (V × I × 60) ÷ (1000 × S) where V is volts, I is amps and S is travel speed in mm/min (per AWS A3.0). For example, 24 V × 200 A at 300 mm/min travel yields 0.96 kJ/mm - knowing this helps you optimize weld quality. Precise settings are crucial for LA City welding license success!

  3. Interpret Welding Symbols & Joint Design -

    Review AWS A2.4 symbol definitions for groove, fillet and backing welds and practice sketching common joint types like square, V- and bevel - grooves. Associating each symbol with its geometry ensures quick recognition on your closed-book exam. Clear joint prep means fewer surprises under test conditions.

  4. Understand Metallurgy & Prevent Defects -

    Learn the carbon equivalent formula (CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15) to predict hardenability and avoid cracking, as recommended by TWI and university materials labs. Study common defects - porosity, undercut, overlap - and their root causes to quickly diagnose issues. Solid metallurgy fundamentals will set you apart as an LA City certified welder.

  5. Adhere to LA City Safety & Code Standards -

    Memorize key safety regulations - proper PPE, ventilation and electrical lockout/tagout - referencing both OSHA and LA City amendments for welding license compliance. Keep a quick-reference checklist of code sections you must know for the closed-book portion of your test. Staying safe and code-savvy makes you a standout candidate for LA City welding certification.

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