Mixed Deck — All CAMT Topics Flashcards

Why does the cooling rate during laser powder bed fusion solidification significantly affect the mechanical properties of metal parts?

Answer: Rapid cooling rates produce finer microstructures and may create metastable phases with different properties than wrought equivalents

The rapid solidification rates in LPBF produce fine grain structures and can create metastable phases in certain alloys, resulting in mechanical properties that differ substantially from cast or wrought versions of the same material.

Why is 'residual stress' a concern in metal AM designs?

Answer: It can lead to part distortion or failure

Residual stress in metal AM parts arises from the rapid heating and cooling cycles during the layer-by-layer melting and solidification process. These internal stresses can cause the part to warp, crack, or distort during or after printing, potentially leading to premature part failure. Managing residual stress through design and post-processing is critical.

Which additive manufacturing process is best suited for producing metal parts with high precision?

Answer: Direct Metal Laser Sintering (DMLS)

Direct Metal Laser Sintering (DMLS) is a powder bed fusion process specifically designed for metal alloys. It uses a high-power laser to selectively melt and fuse metallic powders layer by layer, enabling the production of dense, high-strength metal parts with excellent precision and complex geometries. Other options are for polymers or less precise metal methods.

Which additive manufacturing process uses a photopolymer resin cured by UV light?

Answer: Stereolithography (SLA)

Stereolithography (SLA) is one of the oldest additive manufacturing processes, utilizing a vat of liquid photopolymer resin. A UV laser selectively cures and solidifies layers of this resin, building the part from the bottom up. FDM uses thermoplastic filaments, SLM uses metal powders, and Binder Jetting uses a liquid binder on powder.

Which material property is critical for ensuring successful printing in Powder Bed Fusion (PBF)?

Answer: Powder flowability and particle size distribution

In Powder Bed Fusion (PBF) processes, the ability of the powder to flow smoothly and evenly across the build platform is crucial for creating uniform layers. The particle size distribution affects powder packing density, laser absorption, and ultimately the mechanical properties and surface finish of the printed part. Poor flowability or inconsistent particle size can lead to defects and print failures.

What is the primary function of slicing software in the additive manufacturing workflow?

Answer: Convert a 3D model into layer-by-layer machine instructions

Slicing software converts 3D CAD models into layer-by-layer toolpath instructions (G-code) that guide the additive manufacturing machine during the build.

What is the role of documentation in regulatory compliance?

Answer: It provides verifiable evidence that standards are being met

Documentation provides verifiable evidence that regulatory requirements are being met and creates an audit trail for compliance verification.

Which design feature is uniquely enabled by additive manufacturing?

Answer: Internal lattice structures

Additive manufacturing uniquely allows for the creation of complex internal geometries, such as lattice structures, which are impossible or extremely difficult to produce with traditional subtractive or formative manufacturing methods. These structures enable significant weight reduction while maintaining or even improving strength and stiffness. This design freedom is a key advantage of AM.

What is the primary goal of quality assurance in professional practice?

Answer: To ensure consistent delivery of products or services that meet established standards

Quality assurance focuses on ensuring that products, services, and processes consistently meet or exceed established standards and stakeholder expectations.

Titanium alloys are widely used in metal AM for aerospace applications primarily because of their:

Answer: High strength-to-weight ratio and excellent corrosion resistance

Titanium alloys offer exceptional strength relative to their density along with corrosion resistance, making them ideal for lightweight aerospace structures.

What common challenge do professionals face when applying Project Planning & Scheduling principles?

Answer: Balancing theoretical best practices with practical constraints and real-world conditions

Professionals commonly face the challenge of adapting theoretical best practices in Project Planning & Scheduling to the practical constraints and varying conditions encountered in real-world settings.

In SLS (selective laser sintering) of nylons, the 'refresh rate' of powder refers to:

Answer: The ratio of new powder mixed with recycled powder to maintain consistent material properties

Recycled powder degrades with repeated thermal cycling, so blending it with fresh powder at a controlled ratio maintains consistent flowability and mechanical properties.

Why is extruder (e-steps) calibration important in FDM additive manufacturing?

Answer: It ensures the extruder motor delivers the correct filament length per commanded move

E-steps calibration ensures the extruder motor moves the exact filament length commanded by the G-code, preventing under-extrusion (weak, incomplete layers) or over-extrusion (blobbing and dimensional errors).

What is the recommended approach to staying current in Mechanical Systems & Maintenance?

Answer: Regular professional development, industry publications, and peer collaboration

Staying current in Mechanical Systems & Maintenance requires ongoing professional development, reading industry publications, and collaborating with peers to share knowledge and best practices.

Which best describes the scope of Blueprint Reading & Technical Drawings in professional practice?

Answer: A comprehensive area covering both theoretical foundations and practical applications

Blueprint Reading & Technical Drawings encompasses both theoretical foundations and practical applications that are essential to professional practice in this field.

Which post-processing method is used to relieve internal stresses in metal AM parts?

Answer: Stress relief annealing

Metal additive manufacturing processes involve rapid heating and cooling cycles, which can induce significant internal stresses within the printed part. Stress relief annealing is a heat treatment process designed to mitigate these stresses. By heating the part to a specific temperature below its critical point and then slowly cooling it, the material's microstructure can rearrange, reducing internal stresses and preventing distortion, cracking, or premature failure.

What is the relationship between Mechanical Systems & Maintenance and ethical professional conduct?

Answer: Ethical considerations are integrated into all aspects of professional practice in this area

Ethical considerations are deeply integrated into Mechanical Systems & Maintenance, as professional conduct and integrity underpin all aspects of practice in this field.

What is the relationship between Troubleshooting & Diagnostics and ethical professional conduct?

Answer: Ethical considerations are integrated into all aspects of professional practice in this area

Ethical considerations are deeply integrated into Troubleshooting & Diagnostics, as professional conduct and integrity underpin all aspects of practice in this field.

What is a 'raft' in the context of FDM slicing software?

Answer: A flat mesh base printed beneath the part to improve bed adhesion

A raft is a multi-layer horizontal mesh printed beneath the part that increases contact area with the build plate, improving adhesion and reducing warping especially for shrinkage-prone materials.

How does 'part consolidation' benefit AM designs?

Answer: Reduces assembly time and improves reliability

Part consolidation in AM involves redesigning an assembly of multiple components into a single, integrated part. This significantly reduces the number of individual parts, fasteners, and assembly steps, leading to shorter assembly times, lower manufacturing costs, and improved overall reliability by eliminating potential failure points at joints.