Titanium Welding Safety Precautions

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Why are austenitic stainless steels used extensively in aircraft?

For their high sulfur content.

For their compatibility with welding processes.

For their low melting temperatures and thermal conductivity.

For their high strength and resistance to corrosion at high temperatures. (correct)

Which stainless steel type is an exception in terms of weldability due to its high sulfur content?

AISI 309

AISI 316

AISI 303 (correct)

AISI 317

What should be done more frequently with tack welds when working with austenitic stainless steels?

Apply them with lower current.

Skip applying them on thinner materials.

Use fixtures and jigs for application.

Apply them twice as often as usual. (correct)

Why do thinner materials made of austenitic stainless steels require special precautions during welding?

Due to their lower coefficient of thermal expansion. Signup and view all the answers

Which filler metal alloy is NOT recommended for welding austenitic stainless steels?

AISI No. 303 Signup and view all the answers

Why is it important to clean the base metal just prior to welding austenitic stainless steels?

To prevent the formation of oxides. Signup and view all the answers

What is recommended to clean the surface and joint edges before welding?

A nonchlorinated solvent Signup and view all the answers

Which method is suggested for moving the torch along the joint to form a weld bead?

Forehand method Signup and view all the answers

How is the filler metal typically introduced into the weld puddle?

By dipping it into the center of the weld puddle Signup and view all the answers

What is used to protect the base metal during the welding process?

Inert gas shield or backing flux Signup and view all the answers

What is back purging in welding used for?

To purge the backside of the weld of any ambient air Signup and view all the answers

Why is an AC output waveform typically set in TIG welding of aluminum?

To break up surface oxides with a cleaning action Signup and view all the answers

Why should the welding area be free of air drafts?

To prevent weld embrittlement Signup and view all the answers

Which shielding gas is preferred for manual welding of titanium?

Argon Signup and view all the answers

When is helium used in titanium welding?

In automated welding or when deeper penetration is required Signup and view all the answers

Why should the heat affected zones and root side of titanium welds be shielded?

To prevent contamination by air Signup and view all the answers

What does the secondary, or trailing, shield of gas protect during titanium welding?

The solidified weld metal and heat affected zone until the temperature drops Signup and view all the answers

Why should manufacturer recommendations be followed for electrode, tip grinding, cup size, and gas flow rates?

To ensure optimal performance and weld quality Signup and view all the answers

What is a crucial consideration when repairing an engine mount?

Maintaining the alignment of the structure Signup and view all the answers

How should cracked welds be treated during the repair of an engine mount?

Ground out and replaced with high-grade filler rod Signup and view all the answers

When should an engine mount be replaced instead of repaired?

When all members of the mount are out of alignment Signup and view all the answers

Why are rosette welds used in engine mount repairs?

For attachment to inner or original tube structure Signup and view all the answers

When should extensively damaged engine mount rings be repaired?

Only if the repair method is specifically approved by FAA Engineering Signup and view all the answers

Why is it important to stress relieve an engine mount after weld repairs?

To ensure the structural integrity of the mount Signup and view all the answers

What is the recommended minimum distance between the ends of the inner sleeve and the nearest end of the diagonal cut?

1½ tube diameters Signup and view all the answers

How should the inner and outer replacement tubes be joined to the tube stubs?

Using rosette welds Signup and view all the answers

What should be done to the damaged section of the tube before performing the outer sleeve repair?

Utilize a 90° cut at either end Signup and view all the answers

What is recommended to be used wherever possible during the tubing replacement process?

Fish mouth sleeve Signup and view all the answers

What should be done after cutting two sections of tubing from the inner sleeve material?

Weld them together with a gap and a weld bead over it Signup and view all the answers

What should be done before welding the inner sleeve to the tube stubs?

Ensure a gap of 1⁄8-inch forming a weld bead over it Signup and view all the answers