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info@vaalheattreatment.co.za

Tel +27 (0)16 427 1036

Mitco Industrial Park
Houtkop Ave
Vereeniging
Gauteng
South Africa

Vaal Heat Treatment Services

Sandblasting is a new service Vaal Heat Treatment has to offer to it's current customers as well as others requiring this service.

Weld Distortion Control prevents up to 90% of weld distortion and saves time during welding.

Welding can severely influence strengthened or hardened metals, depending on the hardening technique used. Because of this, post-weld heat treatment is often very helpful in maintaining weld joint strength.

Vibrate Stress Relieve removes thermal stress from a metal part. Thermal stress is caused by a sharp temperature drop in metal. It creates problems of distortion and premature cracking. "Stress relieving" reduces these effects.

Advantages of Weld Distortion Control :

1) Reduces Distortion during the welding process;
2) Saves time during the welding process;
3) Improves welding process;
4) Reduces Thermally induced stresses from welding immediately;
5) Easy to operate;

Case Study

Case Study – Application of Weld Conditioning

weldconditioning

Item Description: Carbon Steel Plates

Water cooled channels through-out requiring much welding and re-positioning of item to control distortion due to welding.
Item stress relieved after fabrication, using either Thermal or Vibration technique.

Problem Description:

Distortion of more than 30 mm when internal supports removed after welding. This requires application of mechanical forces combined with heating to restore to dimensional spec. Possible effect on weld leaks during pressure testing. Requires additional handling of item during welding to do intermittent welding, i.e. welding partial on one section then welding on opposite section to “balance” induced stresses.

Solution:
Applying WELD CONDITIONING during the welding operations

Results:
Welder observed better flow pattern of molten metal resulting in smoother and lower profiled weld bead.

Required no “intermittent” welding pattern, only normal re-positioning of item leading to quantifiable time savings.

Distortion after removal of stiffners was minimal compared to “old technique” and did not require extensive use of mechanical means to correct the dimensions.

Leak test was performed with no weld leaks
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