يتضمن البحث دراسة تجريبية لمعرفة تأثير تغلغل مادة اللحام على قيمة القساوة السطحية في لحامات التقسية السطحية لمطارق كسارة الكلينكر، من خلال تحضير عينات من معدن المطارق X120Mn12 نفسه، تم تقسيتها سطحياً باستخدام أنواع مختلفة من قضبان لحام التقسية السطحية، و تم تغيير البارامترات الخاصة باللحام كشدة التيار و جهة القطبية. تم قياس نسبة التغلغل، و اختبار العينات على القساوة، و دراسة العلاقة بين التغلغل و القساوة، و أثرها على مقدار التآكل الاحتكاكي. أظهرت الدراسة بأن تخفيض تيار اللحام خفّض الدخل الحراري الذي أدى الى تخفيض نسبة تغلغل اللحام، كما لوحظ ازدياد قيم القساوة السطحية للمعدن المقسى و مقاومة التآكل الاحتكاكي مع انخفاض نسبة التغلغل، في حين أن القطبية الموجبة لتيار اللحام أدت الى زيادة نسبة التغلغل و بالتالي انخفاض قيم القساوة السطحية، لكنها أعطت لحام ذو جودة عالية من ناحية تجانس الشكل و انخفاض العيوب. كما أظهرت النتائج أن زيادة نسبة الكروم و الكربون في قضيب لحام التقسية تؤثر ايجاباً على قيمة القساوة.
This study includes an experimental work to determine the effect of dilution on
Hardfacing welding of clinker hammer crusher. In this work, samples have been prepared
from the same metal type of hammer’s, of which is X120Mn12. Then the samples had
been hardfaced using deferent kind of hardfacing Shielded Metal Arc Welding electrodes,
and using deferent welding parameters (current, polarity), the calculation and measuring of
dilution had done and then performed the hardness tests, wear tests, and their relation with
dilution.
This study showed that the reduction of heat input decreases dilution as the hardness
of hardfaced samples increases and wear decreases.
Direct current electrode positive (DCEP) increase dilution as the hardness of
hardfaced samples decreases and wear increases, but the quality of the welding became
better. Results showed that percentage of chromium and carbon in electrodes have positive
effect on hardness.
References used
ASTM A0128_A0128M-93R03 Standard Specification for Steel Castings, Austenitic Manganese
ROBERT, W; MESSLER, Jr. PRINCIPLES OF WELDING. Rensselaer Polytechnic Institute. WILEY-VCH Verlag GmbH & Co. KGaA ,2004
ROBERT، W; MESSLER، Jr. WELDING ENCYCLOPEDIA. American Welding Society. Library of Congress,1997
The study aims to identify the effect of Physical and moral
incentives which provided to employees in the Cement's factory in
Tartous on their satisfaction on their work, and to shed some light
on the incentive systems applied to employees in that sector.
The effects of induction hardening on mechanical properties of two kinds of carbon
steel (0.59%C , 0.35%C) that are widely used in local industry, were discussed by exposed
specimens that were induction hardened with different values of power and i
The substance, Na٢-EDTA, disodium salt of Ethylene Diamine Tetra Acetic
acid, has big influence on the setting time of both Portland cement, and clinker.
The time of initial, and final setting is remarkably changed in the presence of a
small perce
The objective of the study was to determine experimentally
the dust pollution of polyethylene pipe during head- to - head
welding in the workshops piping and its impact on the efficiency of
welding.
The aim of research is to calculate the emissions of carbon
dioxide (CO2) generated by the cement industry (Tartous Cement
Company as a case study), depending on the standards and
principles set by the World Resources Institute protocol (WRI) and