[Ron Wisdom]

Me again,
              Single sided butts should qualify double sided, a practical solution.
As for 1G qualifying 2G and 4G sigle dided, I would like to se this in practice.
For Example the root run settings might work, but the fill parameters may not.
E.G. a 20mm single sided single V 1G might be:

Root run 130A-18V
Fill and cap 250A-28V.

I would be very surprised if you could handle 250A-28V overhead.
It would be difficult horizontally.

Where does the Essential variables of +- 10%Amps – +-7%Volts and +-15% travel come into this?

[Ron Wisdom]

Hi All,
        I understand that AS1554.1 was initially instigated in the early 1930’s and in recent times has used D1.1 as a guide.
I have used this standard extensively in recent times and would suggest that, if taken literally, is the toughest and most restrictive standard I have used in the past 45 years.

I have often wondered why this is so.

There are a number questions I would like answered.

1. AS1554 does not allow pre qualified single sided butt welds on plate.
    They can be qualified by doing bends.
    Why do we do bends to qualify a weld prep?
    I have witnessed 1000’s of bend tests done for this perpose and seen few fail, always with a weld defect in them detected by the 
    macro.
2. Why does this standard require the former size to change, i.e. 3T to 4T relating to tensile strength.
    AS3992 and ASME9 both state 4T for all materials.
3. AS3992 permits procedures on A1 and A2 materials to 13mm in thickness to be written up on paper without and qualification
    providing the weld preps in the standard are used.
4. In my experience Welding Supervisors with experience are rare.
    I understand by talking to TAFE that there are few courses available country wide.
    Is it because Fabricators place little importance on the welding, but concentrate on the Boilermaking?
   

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