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OP as Ed said any work done by this contractor is now scrap. Find a certified contractor. They cost more because it's expensive to get certified

Yes it can be, there many factors, torsional stress, resulting from high torque and rpm, shock, and moment to the box. Like a helicopter gear box. Or gear box connected to a turbo prop, turbine generator, with extreme torque and rpm.

So an audit of the process planning and all the operation is required. Operators and inspector stamps and which machines were used. The cutting fluids and any process used.eg heat treat, passivation, liquid penetrant, stress relief. Etc, until the source can be found. I too in the past delt with...

Gear rim , in this case rib is added for extra strength for the gear. Thickness of the rim and rib can not enough can result in abnormal vibration and wear to the gear. And the gear box assembly

OP It's upto the contractor to spend the money and time to obtain certification. A qualified quality engineer with qualification experience would be required

OP method used was a paste applied with a tube. Like it is done with rtv sealant. I should have mentioned this earlier, those pictures you took look terrible. Those are a mess. Oven brazing should be very clean with capillary action sucks all paste between the details. Details need to be a...

3d Dave very good. OP The answer is complex. I will try to give examples. Keep ot simple, give tolerances of ÷/- 010 and +/- .005. In general. True position .010 and .005 when possible. My specialty is gears. Gear shafts. On shafts manufactureers like between centers, and datum at each end...

Op Send two of the worst parts to a met lab to obtain analysis. To solve what the contamination is. Discuss with the met lab options for analysis.

OP The standard is experience. It all depends on the product and application. Eg ground shafts, gears, critical complex details, sheet metal details, rough castings forgings,

Acknowledge

Acknowledge will

These appear to be in acid solution and not neutralize properly

Ed ground parts are mirror finish and shine.

AMS2759/3 precipitation harden

Op This will not resolve this issue.. Re posting it will not fix it. Hire a consultant with shaft experience. How to set up and machine shafts and how to inspect them.

If parts are left to long in a pickling solution it will be attacked. Causing IGA, pitting and more

Op By visual is appears parts were pasivated baked or pre baked, for plating. It is common to bake parts over 40 HRc for hydrogen embrittlement

Even commercial gears have to be inspected and certified.

Not correct, gears ,spur, bevel, helical have to inspected and certified to a standard. The gear box has to be tested by the manufacture , depending on the industry. Or its function.

Op Have them send a copy of their process planing for review. Did they take pictures After opening the container. Were the parts cleaned and passivated after machining