Study Notes Quiz
With reference to oxy-acetylene welding:
(a) describe the process;(2)
(b) explain why it is important to get the gas mixture correct;(3)
(c) list the design safety features and inspections to be carried out on the welding torch and cylinders before commencing welding.(5)
With reference to gas metal arc welding (MIG) of mild steel:
(a) describe the process;(3)
(b) explain, with reasons, the surface preparation required;(3)
(c) list THREE advantages and ONE limitation.(4)
With reference to joining a steel hull to an aluminium superstructure:
(a) explain, with the aid of a sketch, the process of explosion welding;(6)
(b) explain why this joint is superior to an insulated bolt joint (4)
(a) Outline THREE disadvantages of using aluminium in vessel construction.(3)
(b) Outline THREE advantages of using steel in vessel construction.(3)
(c) Outline FOUR conditions necessary in the preparation of steel surfaces prior to painting, to ensure a good surface finish.(4)
With reference to the attachment of aluminium superstructures to a steel hull:
(a) explain why it is not normal practice to join the two components using conventional welding techniques;(2)
(b) state the particular problems associated with the aluminium superstructure where it is bonded to a steel hull;(2)
(c) outline the maintenance that should be carried out to ensure the continued structural integrity of the vessel;(2)
(d) sketch a typical transition joint that could be utilised to attach an aluminium superstructure to a steel hull.(4)
With reference to TIG welding:
(a) describe the process;(3)
(b) explain why an ac current is preferred when welding aluminium;(2)
(c) explain the advantages compared to other methods.(5)
Describe, with the aid of sketches, FIVE defects that may be present on a weld produced using the covered electrode welding process.(10)
State, with reasons, a different welding/brazing/soldering process that is best suited to effect EACH of the following situations:
(a) joining two lengths of aluminium bronze seawater pipe, both pipes having the same diameter;(2)
(b) attaching a stainless steel handrail to a steel hull;(2)
(c) re-attach a section of broken flange on a cast iron pump casing;(2)
(d) attaching a brass flange onto a stainless steel pipe;(2)
(e) attaching a 1.0 mm steel section to 10 mm thick deckhead plate.(2)