Welding of Metals Chapter AIS Metallurgical Testing in association with AIS Technical Training - Introduction to Steel Industry of Metallurgy...a Metallurgical Tutorial of steels and metals

Metallurgical Testing in association with AIS Technical Training Introduction to Metallurgy...a Metallurgical Tutorial Welding - Carbon Steels - Stainless Steels - Cast Iron - Super Alloys - Steel - Heat Treating - Corrosion - Galvanic corrosion - Ceramics - Refractories
	Welding of Metals We general consider welding to be the joining of two-metals by an arc, and we will keep to this principal because this type of welding is common. Joining two-pieces of metals by a welding arc can only be done if the metals are similar above the melting point of the metals. When the two are not similar then their weldability is difficult and must include transition (buttering) welds. There are four-categories of welding steels and these are- Low Carbon Steels Medium Carbon Steels High Carbon Steels Alloy Steels Welding is a complex metallurgical process that is likened to a steel mill but on a micro scale joining relatively cool pieces of steel. There is a great temperature swing at great rates at a few mm or fraction of an inches away. Welding should be done with a qualified weld procedure (WPS) and a qualified weld operator (WQR). these are ASME terms. Essentially, every weld should be weldable with the end result being that the weld joint (weldment) be stronger than the metals being joined. To achieve this requires great skill of the welder with proper settings on the weld machine, joint configuration, and weld rod, which are written instructions in the WPS (weld procedure) to follow, to make a superior weld with the right desirable weld metallurgy. To Heat Treating
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Metallurgical Testing

in association with AIS Technical Training

Introduction to Metallurgy...a Metallurgical Tutorial

Welding - Carbon Steels - Stainless Steels - Cast Iron - Super Alloys - Steel - Heat Treating - Corrosion - Galvanic corrosion - Ceramics - Refractories

Welding of Metals

We general consider welding to be the joining of two-metals by an arc, and we will keep to this principal because this type of welding is common.

Joining two-pieces of metals by a welding arc can only be done if the metals are similar above the melting point of the metals. When the two are not similar then their weldability is difficult and must include transition (buttering) welds.

There are four-categories of welding steels and these are-

Low Carbon Steels
Medium Carbon Steels
High Carbon Steels
Alloy Steels

Welding is a complex metallurgical process that is likened to a steel mill but on a micro scale joining relatively cool pieces of steel. There is a great temperature swing at great rates at a few mm or fraction of an inches away.

Welding should be done with a qualified weld procedure (WPS) and a qualified weld operator (WQR). these are ASME terms. Essentially, every weld should be weldable with the end result being that the weld joint (weldment) be stronger than the metals being joined. To achieve this requires great skill of the welder with proper settings on the weld machine, joint configuration, and weld rod, which are written instructions in the WPS (weld procedure) to follow, to make a superior weld with the right desirable weld metallurgy.

To Heat Treating

"Poppy" and "Earl" are trademarks of AIS Accident Inspection Specialists. Inc.