scholarly journals Comparison of Nondestructive Testing Methods for Solder, Sinter, and Adhesive Interconnects in Power and Opto-Electronics

2020 ◽  
Vol 10 (23) ◽  
pp. 8516
Author(s):  
Maximilian Schmid ◽  
Sri Krishna Bhogaraju ◽  
E Liu ◽  
Gordon Elger
Keyword(s):  
Nondestructive Testing ◽  
Acoustic Microscopy ◽  
Thermomechanical Stress ◽  
X Ray ◽  
Operation Temperature ◽  
Life Threatening ◽  
Pros And Cons ◽  
Nondestructive Testing Methods ◽  
Degradation Of Materials ◽  
Transient Thermal

Reliability is one of the major requirements for power and opto-electronic devices across all segments. High operation temperature and/or high thermomechanical stress cause defects and degradation of materials and interconnects, which may lead to malfunctions with costly or even life-threatening consequences. To avoid or at least reduce failures, nondestructive testing (NDT) methods are common within development and production of power and opto-electronics. Currently, the dominating NDT methods are X-ray, scanning acoustic microscopy (SAM), and transient thermal analysis (TTA). However, they have different strengths and weaknesses with respect to materials and mechanical designs. This paper compares these NDT methods for different interconnect technologies, i.e., reflow soldering, adhesive, and sintered interconnection. While X-ray provided adequate results for soldered interfaces, inspection of adhesives and sintered interconnects was not possible. With SAM, evaluation of adhesives and sintered interconnects was also feasible, but quality depended strongly on the sample under test. TTA enabled sufficiently detailed results for all the interconnect applications. Automated TTA equipment, as the in-house developed tester used within this investigation, enabled measurement times compatible with SAM and X-ray. In the investigations, all methods revealed their pros and cons, and their selection has to depend on the sample under tests and the required analysis depth and data details. In the paper, guidelines are formulated for an appropriate decision on the NDT method depending on sample and requirements.

Исследование остаточных сварочных напряжений при подводной мокрой сварке низколегированной стали с применением магнитоанизотропного и рентгенодифрактометрического метода

2021 ◽  
pp. 37-50
Author(s):  
В.Е. Никулин ◽  
С.Г. Паршин ◽  
А.М. Левченко
Keyword(s):  
Nondestructive Testing ◽  
Residual Stresses ◽  
Magnetic Anisotropy ◽  
Testing Methods ◽  
Cored Wire ◽  
X Ray ◽  
Residual Welding ◽  
Nondestructive Testing Methods

The present study possibility of assessing residual welding stresses using magnetoanisotropic and X-ray diffractometric methods. Using the method of magnetic anisotropy approve of inhomogeneity of residual stresses in specimens with surfacing made by flux-cored wire and covered electrode in air and underwater has been revealed. The use of two nondestructive testing methods made it possible to determine and compare the values of residual welding stresses.

Counterfeit Parts Recognition and Detection for Failure Analysts

2010 ◽  
Author(s):  
Katherine V. Whittington
Keyword(s):  
Thermal Cycle ◽  
Visual Inspection ◽  
Acoustic Microscopy ◽  
Scanning Acoustic Microscopy ◽  
3D Measurement ◽  
X Ray ◽  
Wide Range ◽  
Electronic Parts ◽  
Testing Awareness

Abstract The electronics supply chain is being increasingly infiltrated by non-authentic, counterfeit electronic parts, whose use poses a great risk to the integrity and quality of critical hardware. There is a wide range of counterfeit parts such as leads and body molds. The failure analyst has many tools that can be used to investigate counterfeit parts. The key is to follow an investigative path that makes sense for each scenario. External visual inspection is called for whenever the source of supply is questionable. Other methods include use of solvents, 3D measurement, X-ray fluorescence, C-mode scanning acoustic microscopy, thermal cycle testing, burn-in technique, and electrical testing. Awareness, vigilance, and effective investigations are the best defense against the threat of counterfeit parts.

scholarly journals Enteric Fever Diagnosis: Current Challenges and Future Directions

Pathogens ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 410
Author(s):  
Durga P. Neupane ◽  
Hari P. Dulal ◽  
Jeongmin Song
Keyword(s):  
Diagnostic Tests ◽  
Enteric Fever ◽  
Asymptomatic Carrier ◽  
Diagnostic Methods ◽  
Effective Control ◽  
Future Directions ◽  
Clinical Presentations ◽  
Global Spread ◽  
Life Threatening ◽  
Pros And Cons

Enteric fever is a life-threatening systemic febrile disease caused by Salmonella enterica serovars Typhi and Paratyphi (S. Typhi and S. Paratyphi). Unfortunately, the burden of the disease remains high primarily due to the global spread of various drug-resistant Salmonella strains despite continuous advancement in the field. An accurate diagnosis is critical for effective control of the disease. However, enteric fever diagnosis based on clinical presentations is challenging due to overlapping symptoms with other febrile illnesses that are also prevalent in endemic areas. Current laboratory tests display suboptimal sensitivity and specificity, and no diagnostic methods are available for identifying asymptomatic carriers. Several research programs have employed systemic approaches to identify more specific biomarkers for early detection and asymptomatic carrier detection. This review discusses the pros and cons of currently available diagnostic tests for enteric fever, the advancement of research toward improved diagnostic tests, and the challenges of discovering new ideal biomarkers and tests.

Track Record of Nondestructive Testing Methods Applied to Steel Plate Quality Indexes at Magnitogorsk Iron and Steel Company

Metallurgist ◽  
2021 ◽  
Vol 64 (11-12) ◽  
pp. 1234-1238
Author(s):  
P. V. Shilyaev ◽  
V. L. Kornilov ◽  
L. S. Ivanova ◽  
A. A. Demidova ◽  
P. A. Stekanov ◽  
...  
Keyword(s):  
Nondestructive Testing ◽  
Steel Plate ◽  
Testing Methods ◽  
Steel Company ◽  
Iron And Steel ◽  
Track Record ◽  
Nondestructive Testing Methods ◽  
Plate Quality ◽  
Quality Indexes

scholarly journals Diagnosing gastric volvulus in chest X-ray: report of three cases

2020 ◽  
Vol 2020 (7) ◽  
Author(s):  
Narendra Pandit ◽  
Abhijeet Kumar ◽  
Tek Narayan Yadav ◽  
Qamar Alam Irfan ◽  
Sujan Gautam ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Acute Abdomen ◽  
Gastric Volvulus ◽  
X Ray ◽  
Pain Abdomen ◽  
Life Threatening ◽  
Chest X Ray ◽  
High Index Of Suspicion ◽  
Specific Symptoms ◽  
Prompt Diagnosis

Abstract Gastric volvulus is a rare abnormal rotation of the stomach along its axis. It is a surgical emergency, hence requires prompt diagnosis and treatment to prevent life-threatening gangrenous changes. Hence, a high index of suspicion is required in any patients presenting with an acute abdomen in emergency. The entity can present acutely with pain abdomen and vomiting, or as chronic with non-specific symptoms. Chest X-ray findings to diagnose it may be overlooked in patients with acute abdomen. Here, we report three patients with gastric volvulus, where the diagnosis was based on the chest X-ray findings, confirmed with computed tomography, and managed successfully with surgery.

Life-threatening presentation of a parahiatal hernia after esophagectomy: a case report and review of the literature

2021 ◽  
Vol 14 (6) ◽  
pp. e242158
Author(s):  
Camille Plourde ◽  
Émilie Comeau
Keyword(s):  
Small Bowel ◽  
Transverse Colon ◽  
Acute Abdominal Pain ◽  
Haemodynamic Instability ◽  
Acute Setting ◽  
X Ray ◽  
Left Diaphragm ◽  
Life Threatening ◽  
Chest X Ray ◽  
Obstructive Shock

A woman presented to our hospital with acute abdominal pain 7 months following an oesophagectomy. A chest X-ray revealed a new elevation of the left diaphragm. CT demonstrated a large left diaphragmatic hernia incarcerated with non-enhancing transverse colon and loops of small bowel. She deteriorated rapidly into obstructive shock and was urgently brought to the operating room for a laparotomy. The diaphragmatic orifice was identified in a left parahiatal position, consistent with a parahiatal hernia. Incarcerated necrotic transverse colon and ischaemic loops of small bowel were resected, and the diaphragmatic defect was closed primarily. Because of haemodynamic instability, the abdomen was temporarily closed, and a second look was performed 24 hours later, allowing anastomosis and definitive closure. Parahiatal hernias are rare complications following surgical procedures and can lead to devastating life-threatening complications, such as an obstructive shock. Expeditious diagnosis and management are required in the acute setting.

Look at the whole X-ray, not just the bones

2006 ◽  
Vol 92 (3) ◽  
pp. 118-120
Author(s):  
S. Warwick ◽  
J. E. Smith ◽  
I. Higginson
Keyword(s):  
Early Diagnosis ◽  
Incidental Finding ◽  
X Rays ◽  
X Ray ◽  
Life Threatening

AbstractA case is presented where an incidental finding on a trauma radiograph led to early diagnosis of a potentially life-threatening tumour, highlighting the need to be vigilant when interpreting X-rays.

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