AWS A5.21 – A5.21M pdf free download

AWS A5.21 – A5.21M pdf free download.Bare Electrodes and Rods for Surfacing.
8. Retest
If the results of any test fail to meet the requirement, that test shall he repeated twice. The results of both retests shall meet the requirement. Material, specimens, or samples for retest may he taken from the original test assembly or sample, or from one or two new test assemblies or samples. For chemical analysis. retest need he only for those specific elements that failed to meet the test requirement. If the results of one or both retest fail to meet the requirement, the material under test shall be considered as not meeting the requirements of this specification for that classification.
In the event that, during preparation or after completion of any test, it is clearly determined that prescribed or proper procedures were not ftllowed in preparing the weld test assembly or test specimen(s) or in conducting the test, the test shall he considered invalid, without regard to whether the test was actually completed or whether test results met, or failed to meet, the requirement. That test shall be repeated, following proper prescribed procedures. In this case, the requirement for doubling the number of test specimens does not apply.
9. Chemical Composition Requirements
9.1 For solid drawn bare surfacing electrodes or rods, a sample of the tiller metal or the stock from which it is made. shall be prepared for chemical analysis. Solid filler metal, when analyzed for elements that are present in a coating (copper flashing for example), shall he analyzed without removing the coating. When the filler metal is analyzed for elements other than those in the coating, the coating shall be removed if its presence affects the results of the analysis for other elements. Rod stock may be analyzed prior to coating for those elements not added in the coating.
9.2 for cast bare surfacing elect rodes or rods, the chemical analysis sample shall be prepared fivin the as-manufactured material on lv.
9.3 For composite metal cored electrodes or rods other than tungsten carbide rods (see 9.5), samples for chemical analysis
may be obtained by any method producing undiluted weld metal or ingot as agreed upon between the purchaser and supplier.
A weld pad may be prepared using the welding process for which it was designed to operate (Figure 1). In case of a dispute,
the weld pad shall be the referee method.
9.3.1 For flux cored composite electrodes and rods, including self-shielded electrodes, the sample for chemical analysis shall he obtained from an undiluted weld pad (see Figure 1) deposited with the welding process for which it was designed.
9.3.2 The dimensions of the completed pad shall be as shown in Figure 1 for each size of electrode. Testing shall be as specified in 9.3.5.
9.3.3 The weld pad test assembly shall he welded in the flat position using welding conditions specified by the manufacturer.
9.3.4 The base metal shall conform to one of the following specifications or its equivalent:
9.3.4.1 ASTM A 285/A 285M
9.3.4.2 ASTM A 36/A 36M
9.3.5 The top surface of the pad or ingot shall he removed and discarded, and a sample for analysis shall be obtained froimi the underlying mew! by amiy appropriate mneamis. Posiweld heat trealmnent ma be used to facilitate this removal J)rocedure. Chemical analysis may he made by any suitable method as agreed 1i)O?l between the J)urchaser and supplier. The referee method shall be the appropriate ASTM method for the element l)eing determined.
9.4 The results of the analysis shall meet the requirements in either Table 1, 2, 3. or 4. for the classification of bare surfacing electrode or rod under test.AWS A5.21 – A5.21M pdf download.