which shielding gas produces deeper penetration on steel?

argon
helium
nitrogen
carbon dioxide

Question

which shielding gas produces deeper penetration on steel?

argon
helium
nitrogen
carbon dioxide

Accepted Answer

{ "quality": "clear", "question_count": 1, "skills_matched": [ "direct_cot", "multiple_choice_formatter", "explain_then_answer", "tutor", "mastery_adaptive_brevity" ], "needs_drawing": false, "concepts_used": [ "Carbon Dioxide Shielding Effects", "Steel Shielding Gases" ], "new_concepts": [], "current_concepts": [ "Carbon Dioxide Shielding Effects", "Steel Shielding Gases" ] } ## Compare ionization potential and thermal conductivity Using the *Carbon Dioxide Shielding Effects* and *Steel Shielding Gases* knowledge points $$ \begin{aligned} &\text{Ionization Potential: } \text{CO}_2 \approx 13.8\text{ eV}, \text{ Ar} \approx 15.8\text{ eV}\ &\text{Thermal Conductivity: } \text{CO}_2 \text{ dissociates into } \text{CO} \text{ and } \text{O}_2 \text{ in the arc, absorbing and releasing high thermal energy.} \end{aligned} $$ ## Determine penetration profile on steel Using the *Carbon Dioxide Shielding Effects* and *Steel Shielding Gases* knowledge points $$ \begin{aligned} &\text{Argon: Narrow, finger-like deep central penetration.}\ &\text{Carbon Dioxide: Broad, deep, and consistent joint penetration profile on carbon steel.} \end{aligned} $$

(A) Argon

(B) Helium

(C) Nitrogen

(D) Carbon Dioxide

{ "subject": "Natural Science", "question_type": "Multiple Choice", "knowledge_point": [ "Natural Science", "Others", "Steel Shielding Gases" ] }

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Question

Explanation:

Compare ionization potential and thermal conductivity

Determine penetration profile on steel

Answer: