How it Works

Experts from the welding industry answer your questions and explain 'how it works'.

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Is a carbon steel pipe acceptable for an oxygen line 1 1/2 dia. between an automatic switch over system (7 bottles) and let’s say 5 drops (outlets) for oxy fuel cutting?

The short answer is below 200 psi and normal temperatures (not hooked to a liquid system only high-pressure cylinders) the carbon steel is ok as long as it has been cleaned for oxygen service.

Why You Cannot Arc Weld Steel to Aluminum

The major reason that you cannot arc weld steels to aluminum and its alloys is the significant difference in melting points of these two metals. The melting point of aluminum is 660 Deg C and that of carbon steel is around 1370 deg C, so as you try to melt the steel the aluminum just flows away from the attempted joint. As a result, just as the steel is beginning to get warm the aluminum is already molten and will end up as just a mess on your workshop floor.


What is Submerged Arc Welding (SAW)?

Submerged Arc Welding (SAW) is a joining process that involves the formation of an electric arc between a continuously fed electrode and the workpiece to be welded.

Why do some standards require that you wait for a few days to inspect welds?

Richard Sanfacon from Englobe explains why some standards require a delay before inspecting welds.

When complete joint penetration groove welds are made with backing bars, sometimes I am asked to remove them after welding and sometimes I am told they can be left. Why is this?

Aaron Dinovitzer from BMT Canada Ltd answers why sometimes backing bars are asked to be removed, and sometimes not, when complete joint penetration groove welds are made.

The information provided is intended for general interest, to educate and inform our audience. The CWB and those providing feedback to the questions do not take any responsibility for any omissions or misstatements that could lead to incorrect applications or possible solutions that industry may be facing.