Question

1. what shielding gas is used to weld aluminum with gmaw? a argon. b nitrogen. c carbon dioxide. d argon with 2% oxygen. answer: 9. which of the following statements about an er90s - b3 electrode is false? a it can be used as both an electrode and a filler rod. b its tensile strength is 90,000. c the composition is chromium - molybdenum. d it is a cored electrode. answer: 10. true or false? an e90t5 - b3 electrode can be used in all welding positions. answer:

Explanation:

For question 8, argon is commonly used as a shielding gas for welding aluminum with GMAW (Gas - Metal Arc Welding) due to its inert properties which prevent oxidation of the molten metal. For question 9, an ER90T5 - B3 electrode is a type of cored electrode used in certain welding applications and has specific characteristics different from what is stated in option A, so option A is false. For question 10, an E90T5 - B3 electrode cannot be used in all welding positions as welding positions depend on multiple factors and not all electrodes are suitable for every position.

Answer:

1. A. Argon
2. A. It can be used as both an electrode and a filler rod. (False)
3. False