Discussion, support and answer relevant questions to CSWIP course

Weld sensitisation will cause which of the following problems?
a. A reduced resistance to corrosion
b. A lower tensile strength
c. Reduced toughness
d. Increase hardness

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Ather term of weld decay, intercrystalline corrosion.
Answer a. A reduced resistance to corrosion

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Follow approved WPS.
Answer 2. Only in accordance with the WPS

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  1. The fabrication specification will give minimum tack length requirements
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In which position would weaving most likely be done?
a. PC
b. PB
c. PF
d. PD

Means which position made highest heatinput: PA and PF.
Follow answer, I consider answer c. PF.

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Overlap at the toe of butt weld using process 135, may be caused by

a. Voltage and current balanced
b. The dropping characteristic
c. The current being too low
d. Current too high

Process 135 MAG, is a semiauto process > Flat characteristic.
Increase current > increase burn off wire electrodes.
So, answer is d. Current too high

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  1. In submerged arc welding, the use of excessively high voltage would result in?
    a) Insufficient flux melting
    b) Excessive flux melting
    c) Slag removal difficulties
    d) Spatter
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  1. What two functions in arc welding must be in equilibrium to enable a stable arc to be established?
    a) Arc voltage
    b) Current
    c) Wire/electrode feed rate
    d) Metal burn-off rate

Excessively high voltage > increase arc length > increase flux consumption.

But in CWIP book has mention about slag:

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Yes, burn off more fluxs and alloy elements, not sure slag quite difficut to remove out.
But refer to 2 options, I recommend to choice " Excessive flux melting"

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Both welder and welding inspectors have access to the WPS before and during fabrication.
NDT operators are not need to access, he may be refer to welding process to evaluate welding imperfection correctly.

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136 is welding process, FCAW.
See symbolic representation in ISO 4063.

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Answer b. Manganese

  1. Prior to production welding commencing you notice that the drawing has been revised and now include a pipe with a wall thickness of 30mm, your WPS only covers wall tthickness of 28mm, what course of action would you follow?

A) Continue with production welding as the difference is less than 10%.
B) Apply for a concession to change the thickness to permit the welding on the 30mm wall thick pipe.
C) Change the range on the WPS to 30mm and allow welding to commence.
D) Allow welding to commence then apply for a concession.

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It should detail answer E. Report to high authority and seeking advise.
Because it ran out of range (thickness) of qualification.

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  1. Before and during welding in the cleaning stage which statements from below would you
    consider are correct?
    A) Only stainless steel brushes and tools shall be used on stainless steels
    B) Only stainless steel brushes and tools shall be used on nickel and non-ferrous steels
    C) Grinding discs containing sulphur (iron sulphite) shall not be used on stainless steels
    D) All of the above
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Stainless consumables and tools should suitable with stainless steel or high chromium.
Answer : D) All of the above

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