Flat -Flush contour weld symbol

Flat or Flush contour weld symbol The “Flat or Flush Contour Weld” symbol is used to indicate that the contour of the weld should be either flat or flush with the surface of the base …

AWS-Flat-or-Flush-weld-Symbol

Flat or Flush contour weld symbol

The “Flat or Flush Contour Weld” symbol is used to indicate that the contour of the weld should be either flat or flush with the surface of the base metal. This symbol is commonly used in welding applications where the appearance of the weld is important, such as in architectural or decorative applications.

The contour of the weld is indicated by adding a symbol above the reference line. A flat or Flush contour weld is indicated by a straight line above the basic weld symbol placed on the reference line.

AWS Flat or Flush weld Symbol

In AWS A2.4, Flat or Flush weld symbols are considered as Supplementary Weld Symbols. Flat or Flush symbol is placed on the primary/ basic weld symbol by a flat line. Additional letters as shown in below figure are used to represents the methods by which flat or flush contour is achieved. Following are the flat/ flush contour letters and their meaning:

  • C = CHIPPING
  • M = MACHINING
  • G = GRINDING
  • P = PLANISHING
  • H = HAMMEBING
  • R = ROLLING

ISO Flat or Flush weld Symbol

ISO Flat or Flush weld Symbol is same as AWS Weld symbol. In below picture, ISO weld symbol for Flat or Flush weld is given for your reference.

See also  Weld all around symbol

Does Flat or Flush weld are same?

The terms “Flat” and “Flush” are often used interchangeably when referring to weld contours, but in some contexts, they can have slightly different meanings.

In general, a “Flat” weld contour means that the weld surface is level with the surface of the base metal, while a “Flush” weld contour means that the weld surface is flat-finished to the surface of the base metal.

 in many welding applications, the terms “Flat” and “Flush” are used interchangeably to indicate that the contour of the weld should be smooth and even with the surface of the base metal.

In terms of welding symbols, the “Flat or Flush Contour Weld” symbol is used to indicate that the contour of the weld should be either flat or flush with the surface of the base metal, and the specific contour desired can be indicated with additional symbols or annotations.


Sandeep Kumar is a highly experienced welding professional and author known for his expertise in welding symbols. With certifications including IWE, AWS-CWI, and ASNT NDT Level III.

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