When welding aluminum pipe in the 2G position with GMAW, run the remaining passes using a slight ...

When welding aluminum pipe in the 2G position with GMAW, run the remaining passes using a slight
  side-to-side motion to _____.
 
  a. keep the weld pool small
  b. prevent weld puddle sagging
  c. ensure fusion at the toes
  d. help cool the crater

---

[Ques. 2] When using GMAW on aluminum pipe in the 1G-ROTATED position, the work angle for the root pass
  should be _____.
 
  a. 0 degrees
  b. 30 degrees
  c. 45 degrees
  d. 75 degrees

---

[Ques. 3] When using a permanent backing ring, insert the ring inside one of the coupons and make an allowance for
  the root opening, which can be up to _____.
 
  a. 1/4 (6.4 mm)
  b. 3/16 (4.8 mm)
  c. 1/8 (3.2 mm)
  d. 3/32 (2.4 mm)

---

[Ques. 4] When preparing aluminum pipe coupons, use an approved solvent and a clean rag to remove any grease or
  oil within a minimum of _____.
 
  a. 1-1/2 from the weld joint
  b. 1 from the weld joint
  c. 3/4 from the weld joint
  d. 1/2 from the weld joint

---

[Ques. 5] When setting up the welding equipment for GMAW on aluminum pipe, the proper shielding gas to use is
  _____.
 
  a. propane
  b. acetylene
  c. an argon/carbon dioxide mix
  d. argon or an argon/helium mix