AWS C1.4M-C1.4 pdf free download

AWS C1.4M-C1.4 pdf free download.Resistance Welding of Carbon and Low-Alloy Steels.
4. General
An acceptable weld has a pulled button diameter greater than the minimums shown in Table I for spot welds. Table 2 for projection welds, or Table 3 for seam welds. At the start of a production run, the welding machine. tooling and setup should he able to produce a pulled button diameter as close as practical to the setup values as shown in the Lahies. or per established quality plan. which may include statistical methods. For recommended guidelines to obtain the desired setup button diameter or seam width, see AWS Cl.1M/CI.l. Recoiniiiended Praclices for Rc’sisiancc’ lVelcling. As production welding continues, the button diameter may decrease in size to the minimum button diameter. When the button diameter falls outside of the established limits, adjustment of the equipmern. electrode maintenance or both should be required to reestablish the button diameter to above the nominal and approaching the setup diameter, or per the quality plan. For purposes of welded assembly design simulation, the intended strength of the weld shall be based upon the minimum pulled button diameter, as specified in Table 1. 2, 3, 4, or 5.
4.1 Materials. This specification is applicable to resistance welding of carbon and low-alloy steels with a carbon content of up to 0.60% (by weight). For seam welding, the specification is limited to carbon and low-alloy steels with a carbon content of up to 0.25% (by weight). The aforementioned carbon contents are specified in International Iron and Steel Institute (lIST)
specifications. Hardenable steels may require a temper- ing treatment after welding to provide sufficient ductility.
4.2.2 Organic Coatings. Steels with organic coatings, such as those containing zinc-rich primers and certain proprietary zinc-rich coatings, can be welded provided the welds meet the requirements of this specification. 4.3 Surface Conditions. The surface of the material at the time of welding should be free of all contaminants, such as rust, dirt, and contaminated drawing oils and compounds, that would adversely affect weld quality. The use of weld-through primers and sealers is accept- able, where the limitations and special requirements imposed by the specific primer or sealer are recognized and the weld quality requirements of this specification can be met. The suitability of a particular coating, primer, or sealer shall be ascertained in preproduction testing. 4.4 Part Fitup. The accuracy and the surface conditions of mating parts should be such that contact at the faying surface can be obtained with fixturing and clamping, and through the use of an adaptive control procedure that ensures suitable contact at the faying surface prior to the application of weld current. Welding electrodes should not be used as clamping tools or to bring the mating parts into contact.
6.1.1 Test Spccirnens. When a test specimen is used. the material thickness, composition range, material coatings. weld edge distance, spot spacing, and the general weld area contour and part IlL should be the same as the production part. When the application of a weld-through primer or sealer is required for production parts, the test specimen should have these materials applied before welding in the same manner as applied to the production parts. When a substantial amount of magnetic materials. such as the assembly fixture, locators. etc.. is inserted in the throat of the welding machine during welding of a production part. this condition should he closely duplicated for the test specimen. except when it can he denionstrated that the welding process is unaffected by the amount of magnetic material inserted into the throat of the machine.
6.2 Visual Examination and Tolerances of Welded Assembly or Test Specimen. All welds shall be subject
to examination to determine conformance with 7.2.1 and 7.2.2.AWS C1.4M-C1.4 pdf download.