Weldability and Fusion Weld Strength Quiz

Welding Material Properties

• Materials with high carbon content typically exhibit poorer weldability due to their increased susceptibility to cracking.

Fusion Welding Characteristics

• In fusion welding, the area with the highest tensile strength is usually the weld metal itself, due to the solidification and cooling processes involved.

Weld Defects Terminology

• A crater crack in welding is alternatively referred to as a "crater type" crack or simply a "crater."

Lamination Issues in Welding

• If a lamination extends into the bevel face, the welding inspector should request that the material be rejected or repaired before proceeding with welding.

Arc Deviation in Welding

• The term for the deviation of the arc during arc welding caused by external magnetic influences is known as "arc blow."

Factors Affecting Weldability

• Factors affecting the weldability of a material include its chemical composition, thickness, and the presence of impurities or alloying elements.

Repair vs. Production Welding

• Repair welding is often more difficult than production welding due to the unpredictable nature of defects in existing structures and different joint configurations.

Hydrogen Cracking

• Hydrogen cracking in weld metal is especially likely when welding high-strength low-alloy steel or other steels susceptible to hydrogen embrittlement.

EN Standard 288

• EN standard 288 primarily pertains to the approval of welders and welding procedures, ensuring quality assurance in welding operations.

Causes of Porosity in Welds

• Porosity in a weld is typically caused by trapped gases, often resulting from contamination of the base material or inadequate shielding during the welding process.

Bend Test Mechanics

• In a bend test where the face of the specimen is in tension and the root is in compression, a "face bend test" is conducted to evaluate the ductility and soundness of the weld.

Ultrasonic Testing Advantages

• Ultrasonic testing is advantageous for detecting internal weld imperfections such as incomplete fusion or voids, providing a strong advantage over visual inspection techniques.

Heat Input Consequences

• Having too low heat input during welding can result in poor penetration and potentially increase the risk of defects, such as undercuts or porosity.

Collet Usage in Welding

• A collet is commonly used in welding processes such as TIG (Tungsten Inert Gas) welding for holding the tungsten electrode securely.

Sub-Arc Welding Characteristics

• The sub-arc welding process commonly utilizes a constant voltage characteristic, which helps maintain consistent weld quality.

Electrode for Austenitic Stainless Steel

• The appropriate electrode for TIG welding of austenitic stainless steel is often the E308L, known for its excellent corrosion resistance and mechanical properties.

Heat Affected Zone (HAZ)

• The Heat Affected Zone (HAZ) of a fusion weld typically contains microstructural changes, which may include grain growth, sensitization, and potential hardness variations.

Electrode Standards for Submerged Arc Welding

• The standard related to electrode wire and fluxes for submerged arc welding of carbon steel and medium tensile steel is typically AWS A5.17 or equivalent.

Test your knowledge on materials weldability, tensile strength of fusion welds, and alternative names for crater cracks. Questions are based on CAWIP book, page 9.12. Practice and improve your understanding of welding concepts.