Skip to main content

TRANSVERSE TENSILE TEST

TRANSVERSE TENSILE TEST

Object:   Used to measure the transverse tensile strength under static loading of a butt joint employing butt welds.
The reduced section tensile test normally fails in the parent metal and so it is not designed to give the tensile strength of the weld.
The radius reduced tensile test is a test of the as deposited diluted weld metal.
The all weld tensile test, using a longitudinal section from the weld only, is used to check the as deposited undiluted weld metal. (Usually used by consumable manufacturers.)

Method: The test piece is clamped at each end and a load is applied by an hydraulic or screw mechanism. The load is increased until fracture occurs.

Reporting Results:
  1. Type of specimen (e.g. reduced section). 
  2. Whether excess eld metal is removed or not.
  3. Tensile strength, in Newtons per mm squared, is calculated from maximum load and original cross sectional area. When excess weld metal is not removed, the cross sectional area shall be the prod uct of the parent metal thickness and the width of the specimen.
  4. Location of fracture - whether in parent plate, heat affected zone or weld metal. If the fracture is in the parent metal, the distance from the weld zone shall be stated. 
  5. Location and type of any flaws present on the fracture surface.

The test gives a measure of percentage elongation, percentage reduction in area and ultimate
tensile strength.

The tensile test gives a measure of DUCTILITY.
(in Newtons per mm squared), a combination of percentage elongation and percentage reduction in area.
Labels:

Popular posts from this blog

ULTRASONIC TEST

ULTRASONIC TEST INTRODUCTION This method is used to test a variety of both metallic & non metallic products such as welds, forgings, castings, sheets, etc. It has an advantage of detecting sub-surface discontinues with accesses to only one side of the specimen. In this method beams of high frequency sound waves are introduced into the material being tested. The sound waves travel through the material with some loss of energy & are reflected back . This is detected & analysed to detect the presence of flaws. This test employs ultrasonic waves. These waves are mechanical waves that consist of oscillations or vibrations. METHOD TRANSMISSION SYSTEM This method employs two Transducers, one for sending & other for receiving the pulses. These may be short or continuous & are transmitted through the material. The result gets displayed on the CRO connected. The settings of the CRO can be adjusted with respect to time & distance. Prior to testing couplant is used to prov...
Read more

MAGNETIC PARTICLE EXAMINATION (M.P.I.)

MAGNETIC PARTICLE EXAMINATION (M.P.I.) INTRODUCTION This method is used for detecting cracks and other discontinuities open to surface or sub surface in ferromagnetic materials. Fine magnetic particles are applied to the surface of a part which has been suitably magnetized. The particles are attracted to regions of magnetic non-uniformity associated with defects and discontinuities, thus producing indication which are observed visually. PRINCIPLE When a piece of metal is placed in a magnetic field and the lines of magnetic flux get intersected by a discontinuity such as a crack or slag inclusion in a casting, magnetic poles are induced on either side of the discontinuity. The discontinuity causes an abrupt change in the path of magnetic flux flowing through the casting normal to the discontinuity, resulting a local flux leakage field and interfering with the magnetic lines of force. This local flux disturbance can be detected by its affect upon magnetic particles that collect o...
Read more

FILLET WELD FRACTURE TEST

FILLET WELD FRACTURE TEST Object :  To break the joint through the weld to permit examination of the fracture surfaces for flaws and to check root penetration and fusion. Method: The specimen is cut to length and a saw cut, normally 2 mm deep, is made along the center of the weld face. The specimen is fractured by bending or hammer blows. Reporting Results: Thickness of parent material.  Throat thickness and leg length.  Location of fracture. Appearance of joint after fracture. Depth of penetration / lack of penetration or fusion.
Read more