AWS C2.21M/C2.21 PDF

General.

The acceptance inspection is part of a quality assurance program to provide test results to purchasers with that show that the thermal spray equipment operates according to the manufacturer’s specifications. The equipment is presumed to be installed, operated, and maintained in accordance with the manufacturer’s technical instructions. This specification does not cover low pressure or vacuum plasma acceptance due to their complex operation, but it may be used as a starting point.

It is the responsibility of the manufacturer to provide evidence of the operating capabilities of the thermal spraying equipment. Evidence of the equipment capabilities may also be verified by the purchaser using criteria described in Section 6. The spraying equipment may be considered adequately designed if all the requirements specified in Section 5 are satisfied in the tests described in Section 6. The values thereby obtained and any other data of significance in deciding the suitability of the equipment should be recorded as shown in Annexes I, II, III, IV, or V.

This document specifies the requirements for acceptance inspection of the following types of thermal spray equipment:

(1) Plasma

(2) Flame powder, wire, rod, and cord

(3) Wire arc

(4) High-velocity oxygen fuel (HVOF)

Safety.

This document also specifies hazardous operations and equipment. This specification does not address all of the safety problems associated with its use. It is the responsibility of the user of this specification to establish appropriate safety, environmental, and health practices, and determine the applicability of regulatory limitations prior to its use.

This document addresses acceptance criteria such as tolerances of controlling feed rates, current levels and gas flows. It does not address basic safety issues that these classes of equipment should meet, i.e., the use of safety interlocks, backflow prevention devices and ability to meet NFPA and National Electrical Codes such as UL or the European ones.

The following standard contains information that is useful.

(1) American National Standards Institute. ANSI Z49.1, Safety in Welding, Cutting, and Allied Processes, New York, New York.¹

Units of Measure.

This specification makes use of both the International System of Units and U.S. Customary Units. The measurements are not exact equivalents; therefore each system must be used independently of the other without combining in any way. The specification C2.21M uses SI Units. The specification with the designation C2.21 uses U.S. Customary Units. The latter are shown in appropriate columns in tables or within parentheses ( ) when used in the text. Suitable conversions encompassing standard sizes of both can be made, however, if appropriate tolerances are applied in each case.

1. Available from Global Engineering, 15 Inverness Way East, Englewood, CO 80112-5776.