The joint region should have the same cross section of the rest of the gauge length portion of the tensile specimen. Hence, it is MANDATORY to remove flash (in case of solid state welding processes like friction welding, linear friction welding, friction stir welding etc.) and excessive reinforcement (in case of fusion welded joints). If they are not removed, the additional flash and reinforcement will increase the area of the cross section to support additional tensile load and shift the failure location from weld zone to HAZ or base metal. A flash or reinforcement is never retained on the welded components in practical use. Therefore, it is necessary to find out the failure location accurately which requires removal. Otherwise, the original strength of the welded joint will also be unknown.
Dear Mr. Sudhir Kumar
the remove of welding flash not necessary during tensile test with taking into consideration the cross section area dimensions.
You should remove all kinds of surface irregularities otherwise it will affect on your tensile properties badly.
The joint region should have the same cross section of the rest of the gauge length portion of the tensile specimen. Hence, it is MANDATORY to remove flash (in case of solid state welding processes like friction welding, linear friction welding, friction stir welding etc.) and excessive reinforcement (in case of fusion welded joints). If they are not removed, the additional flash and reinforcement will increase the area of the cross section to support additional tensile load and shift the failure location from weld zone to HAZ or base metal. A flash or reinforcement is never retained on the welded components in practical use. Therefore, it is necessary to find out the failure location accurately which requires removal. Otherwise, the original strength of the welded joint will also be unknown.
Dear Mr. Sudhir Kumar,
Greetings to you. The flashes will appear on the either sides of the weld line. When you are preparing the specimen for tensile testing (dog bone shape), it will affect the cross sectional area and hence the results of tensile testing. To get better results, it is recommended to remove the flashes from the weld region.
Have a good day
The excess metal in flash practically does not influence the tensile strength of weld joint until it introduces any discontinuity or continuity defects at the joint.
In continuation to my earlier response it may also be noted that continuity and discontinuity defects of the matrix introduced by the flash put adverse effect to joint strength when they influence reduction in effective cross sectional area of the joint.
if you need exact results, you should remove the flash. to compare the results of welded material and parent material it would be necessary to remove the flash due to stress concentration near the flash during the tensile test.
You should remove flash, surface irregularities and all areas of roughness.
Flash reduces surface integrity and continuity which may show change in tensile strength during testing. It must be removed prior to tensile test.
Hi Sushir,
As rightly pointed out by other experts, it is important to remove flash before tensile testing. In my opinion, its because of following reasons:
1. With flash, the local cross-section of the joint will not be equal to the base metal and there would be deviation from acceptable standards. Both the strength and ductility values would be misleading.
2. Flash may contain micro-defects and can initiate failure there in. The failure location will not be the true representative of the actual service condition, as these are universally removed before putting in to service.
Thanks.
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