Fillet Weld Break Test / Fracture Test

The fillet weld break test is a mechanical testing process for examining the root penetration in a destructive manner. While the macro-etch test provides penetration depth of the specimen in a given area, the fillet weld break test examines the root penetration for the entirety of the specimen. The test includes the potential failure points of the weld which are the stop and restart of the weld.

To pass the break test, the specimen must bend flat upon itself without fracturing. Should fracture occur, the fractured surface shall show no evidence of cracks or incomplete root fusion, and the sum of the lengths of inclusions and porosity visible on the fractured surface shall not exceed 3/8 in (10 mm) in Figure as shown below,


Break Test Procedures

  1. Cut 25 mm off of each end of the 150 mm specimen resulting in a 100 mm specimen (the 25 mm Specimens will be used for the macro etch test)
  2. Be sure the table is clear of all obstructions
  3. Place the T joint on an angle with the weld metal face up as shown in Figure, subjecting the root of the weld to tensile stress
  4. Drop the press on the material until the specimen breaks or lays flat on itself
  5. Examine the results



The macro-etch test will be utilized to gain a penetration reading of each test specimen. The macro-etch test allows for the observation of the weld penetration profile by sectioning the weldment. The profiles will be observed for the effective throat depth. The information will be recorded to verify the acceptance and integrity of each weld performed from a penetration stand point. The results will be compared with the results from the mechanical testing processes (i.e. break test) to help define the failure limits of various penetration depths.

EN 10204 Test certificate standards and types for welding consumables

Requirement of different EN certification for welding consumable is shown below:

Certificate Type

Title Summary of EN10204 requirements



Declaration of compliance with the order Statement of compliance with the order by the manufacturer No test results shown


Test report Statement of compliance with the order by the manufacturer based on non-specific inspections (tests) by the manufacturer. Like the old BS1449 ‘Cast Test’ certificate. Mechanical test sample results from another coil from same cast, manufactured by the same process route, can be used.


Inspection certificate Statement of compliance with the order by the manufacturer with results of specific inspection Common certificate type issued for ‘batch tested’ material. Cert. issued and signed by manufacturer’s representative, who must be independent of the manufacturing department. Eg Inspection department or test house manager/supervisor


Inspection certificate Statement of compliance with order with indication of results of specific inspection Batch test results. Cert. issued by both manufacturer’s representative and an independent inspector appointed either by the customer or an inspector designated by official regulations. This cover what is often referred to as ‘outside inspection’

When the 3.2 certificate type is requested the manufacturing mill may prepare a 3.1 type certificate to present to the ‘outside inspector’ to use as a basis for preparing the independent 3.2 certificate. Only the 3.2 certificate is valid however for the ordered requirements and to match the product marking and inspectors stamp.

Reference: Donghao stainless steel literature

Keep reading, Happy welding

KP Bhatt