What is a Weld map or Weld Trace?
A weld map tell what to weld, where to weld and how to weld. A weld map is a type of drawing for numbering the welds joints to work as a guide for the welder & production. Each weld on the drawing is given a number. These numbers are then further elaborated to highlight the joint location, applicable WPS, thickness, and other essential variables for that specified joint. used to number each of the welds or joints on it.
See the weld map example below; this example includes nine welds of pressure vessels. This weld map shows welds with circumferential seam, longitudinal seam, and boot weld. Nozzle weld and support pad weld are not covered in this weld map. The below sketch shows a weld map for a vessel. Here, four WPS’s are given for the welding of this part.
Another example of this weld can be made by numbering the weld seam and then referencing these weld seams along with their respective WPS in a table.
WPS No. 01 is for long seams and circ-seam of the vessel.
WPS No. 02 is for dish head to shell weld.
WPS 03 is for the nozzle to shell.
A welded component can have a number of WPS which need to be shown on the drawing. A weld map is the best to help with it. The weld map can also be made in a table showing the joint number, applicable WPS, material thickness, type of joint, welding process, and any other essential details as deemed necessary. The weld map is a non-standard requirement and can be given in any way that suits best to the manufacturer and satisfies the client’s requirements.
Weld map for Piping
A weld map and weld log support each other. The joints given on a weld map are transferred on the weld log. with the help of both, detailed information on welding is provided to the user. A weld map tells what to weld, where to weld, and how to weld. The weld map provides a visual of the weld joint to easily locate them during the fabrication stage.
The below sketch shows a weld map of a piping spool. Here, weld joints are identified from 001 to 009 i.e. there is a total of 9 welds.
A weld log is created as shown in the below sample, which shows the applicable joint number, type of weld, segment identification, material thickness, and applicable WPS. Such logs are very beneficial to aid a brief WPS package review to the Welding engineers, welding inspector, and shop persons.
Why weld map and weld log is required?
A Weld map works as a guide to the welding shop to provide necessary information for the fabrication of a component. Each welding code, client, and company will have a standard practice to address the requirements applicable to the scope of the project. Such logs are very beneficial to aid a brief WPS package review to the Welding engineers, welding inspector, and shop persons.
A weld map tells what to weld, where to weld, and how to weld. The weld map provides a visual of the weld joint to easily locate them during the fabrication stage.
What is a weld log sheet?
Weld Map Template
A Sample Weld Map Template can be downloaded from this link. You can use this or a similar format for your weld map requirements.