AWS D14.4-D14.4M pdf free download
AWS D14.4-D14.4M pdf free download.Welded Joints in Machinery and Equipment.
The terms that follow are defined for the purposes of this specification. Other terms used in this specification are defined in AWS A3.0, Standard Welding Terms and Definitions. effective weld areas 1. groove welds. The effective area is the effective weld length multiplied by the weld size (see 5.17.1 for additional details). 2. fillet welds. The effective area is the effective weld length multiplied by the effective throat (see 5.17.2 for additional details). 3. plug and slot welds. The effective area shall be the nominal area of the hole or slot in the plane of the faying surface. Engineer. The responsible technical authority. Manufacturer. The organization responsible for the per- formance of the work covered by this specification. maximum allowable stress. The ultimate tensile strength of the base metal, divided by the safety factor selected by the designer. It is suggested that the safety factor not be less than four (4). non-redundant load path structures. Structures where there is only one load path and where a fracture will cause collapse. Owner. The person, company, or agency that purchases the equipment.principal structural weldments. Those weldments that carry the main working loads during normal operations. primary welds. Welds, the failure of which would result in (1) a carried load being dropped in excess of 4 in. [100 mm] or (2) an increase of stress beyond the allowable stress limits, as defined in Table 2, Allow- able Stresses, in other welds or base metal. Any welds subject to only compressive stresses are not consid- ered primary. redundant load path structures. Structures with redun- dant load paths have multi-load paths where a single fracture in a member cannot lead to collapse. stress range. The algebraic difference between the maximum stress and minimum stress. secondary welds. Welds not covered by the require- ments of primary welds. Secondary welds shall be noted as such on the drawings. They must carry com- pressive stress only or be subjected to a stress of less than 5000 psi [34.5 MPa]. Secondary welds only need to meet the requirements of Section 6, Workmanship, and Section 8, Weld Quality and Inspection. tensile strength of the weld metal. The minimum tensile strength specified for the filler metal classification as published in the applicable filler metal specification. 4. Classification of Welded Joints 4.1 Joint Classes. Welded joints are divided into the fol- lowing six classifications based on the design of the joint and anticipated performance (see Figure 1). Each class is also rated for inspection requirements (see Table 1) and max imum allowable stress levels (see Figure 2 and Table 2) which are described in later sections of this specification. 4.1.1 Class I is a complete joint penetration butt joint weld, welded from both sides with the root of the first side chipped or gouged and ground back to sound metal and reinforcements ground or machined flush with the direction of removal parallel to the principal stress.5 4.1.2 Class II is a complete joint penetration butt, T-, or corner joint welded from both sides, with the root of the first side chipped or gouged and ground back to sound metal before depositing the second side. 5,6 4.1.3 Class II is a complete joint penetration butt, T-, or corner joint welded from both sides, or from one side using backing strips which are not removed after welding. AWS D14.4-D14.4M pdf download.
