Welding Defects

Views:
 
Category: Education
     
 

Presentation Description

https://pursuitengineering.blogspot.com/2017/01/welding-defects.html Lack of Penetration It is the failure of the filler metal to penetrate into the joint. It is due to (a) Inadequate de-slagging (b) Incorrect edge penetration (c) Incorrect welding technique. Lack of Fusion Lack of fusion is the failure of the filler metal to fuse with the parent metal. It is duo to (a) Too fast a travel (b) Incorrect welding technique (c) Insufficient heat Porosity It is a group of small holes throughout the weld metal. It is caused by the trapping of gas during the welding process, due to (a) Chemicals in the metal (b) Dampness (c) Too rapid cooling of the weld.

Comments

Presentation Transcript

Welding Defects https://pursuitengineering.blogspot.com/2017/01/welding-defects.html :

Welding Defects https://pursuitengineering.blogspot.com/2017/01/welding-defects.html

Lack of Penetration :

Lack of Penetration It is the failure of the filler metal to penetrate into the joint. It is due to ( a ) Inadequate de- slagging ( b ) Incorrect edge penetration ( c ) Incorrect welding technique.

Lack of Fusion :

Lack of Fusion Lack of fusion is the failure of the filler metal to fuse with the parent metal. It is duo to ( a ) Too fast a travel ( b ) Incorrect welding technique ( c ) Insufficient heat

Porosity :

Porosity It is a group of small holes throughout the weld metal. It is caused by the trapping of gas during the welding process, due to ( a ) Chemicals in the metal ( b ) Dampness ( c ) Too rapid cooling of the weld.  

Slag Inclusion :

Slag Inclusion It is the entrapment of slag or other impurities in the weld. It is caused by ( a ) Slag from previous runs not being cleaned away, ( b ) Insufficient cleaning and preparation of the base metal before welding commences

Undercuts :

Undercuts These are grooves or slots along the edges of the weld caused by ( a ) Too fast a travel ( b ) Bad welding technique ( c ) Too great a heat build-up.

Cracking:

Cracking It is the formation of cracks either in the weld metal or in the parent metal. It is due to ( a ) Unsuitable parent metals used in the weld ( b ) Bad welding technique.

Poor Weld Bead Appearance   :

Poor Weld Bead Appearance   If the width of weld bead deposited is not uniform or straight, then the weld bead is termed as poor. It is due to improper arc length, improper welding technique, and damaged electrode coating and poor electrode and earthing connections. It can be reduced by taking into considerations the above factors.

Distortion :

Distortion Distortion is due to high cooling rate, small diameter electrode, poor clamping and slow arc travel speed

authorStream Live Help