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WHAT CAN CAUSE CONTAMINATION IN A WELD BEAD?

Both oxygen in the form of oxides and hydrogen can originate from the surface of the filler metal…

# WHAT INSPECTION TESTS EXIST IN WELDING? Welding inspection tests are divided into two major categories: — ## 1. NON-DESTRUCTIVE TESTING (NDT) These tests evaluate the weld without damaging or destroying the part. – Visual Inspection (VT): Direct examination of the weld bead to detect surface discontinuities such as cracks, porosity, undercut, overlap, and improper weld profile. – Liquid Penetrant Testing (PT): A penetrant liquid is applied to detect surface-open discontinuities on non-porous materials. – Magnetic Particle Testing (MT): Uses magnetic fields and ferromagnetic particles to detect surface and near-surface discontinuities in ferromagnetic materials. – Radiographic Testing (RT): Uses X-rays or gamma rays to detect internal discontinuities such as porosity, slag inclusions, and lack of fusion. – Ultrasonic Testing (UT): Uses high-frequency sound waves to detect internal and surface discontinuities, as well as to measure weld thickness. – **Ed

Inspection and testing methods are grouped into two types: destructive and non-destructive. The former, which are performed exclusively…

# WHAT ARE DUPLEX STAINLESS STEELS?

Duplex stainless steels are so named because their microstructure consists of equal parts austenite and ferrite. In cast…

WHICH ELECTRIC ARC PROCESSES REQUIRE GAS SHIELDING?

Currently there are more than 100 welding processes classified and endorsed by AWS, but the vast majority of…

7 FUNDAMENTAL FACTORS IN ELECTRODE SELECTION FOR ELECTRIC ARC WELDING.

1.- Identify the base metal. 2.- Know the type of current available for welding, that is, whether direct…