资源介绍:  

This British Standard is one of a series of standards on the approval testing of welders and welding procedures. This link has been used as a means of arranging the series of standards into
(a) approval testing of welding procedures,
(b) welder approval when welding procedure approval is required,
(c) welder approval when the welding procedure is not required to be approved for either technical or contract reasons.
This standard covers the simple approval of welders on sheet, plate and pipe when no welding procedure
approval is required. For the purposes of this standard, welders are considered to have already received training in the welding of aluminum and its alloys.
To complete the philosophy behind this series of standards. It is considered useful to give details of the practices relating to welding procedure approval even though they are not strictly relevant to this standard. Depending upon the emphasis placed on quality control In the production of welded components, the approval of welding procedures may be administered in one of several ways, which should be stipulated at the enquiry and/or order stage. The alternatives currently employed are the following.
1. Each Individual contractor (or subcontractor) may have proved by actual test pieces every weld form he
wishes to use, In every thickness and material.
2. Each individual contractor (or subcontractor) may have proved by actual test pieces a set of welds representative on a group basis, of all the various thicknesses and materials to be used in production.
3. Each individual contractor (or subcontractor) need not make procedure test pieces provided that he can
prove, by appropriate authentic documentation of an Independent nature, that he has previously welded the
type of joint and material In question satisfactorily.
In respect of 1 and 2 above, It should be appreciated that once the welding procedure tests have been approved, they need never be repeated unless there Is a change In certain variables. As an extension beyond 3, It may be possible in the future for fully documented welding procedures, developed independently of the particular contractor, to be employed without the need for further approval tests.
This British Standard specifies requirements for the approval testing of welders to be engaged on the TIG or MIG welding those aluminum and aluminum alloy fabrications for which the welding procedure itself does not have to approved.

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